Payables and Accruals [Abstract] Payables to servicing and subservicing investors Assets Sold under Agreements to Repurchase, Repurchase Liability Payables to servicing and subservicing investors Financial Services Liabilities Payable to GSEs and securitized trusts Accounts Payable, Government Sponsored Entity Accounts Payable, Government Sponsored Entity Lease liabilities Operating Lease, Liability MSR purchases payable including advances Purchase of Mortgage Servicing Rights Payable Purchase of Mortgage Servicing Rights Payable Other liabilities Other Liabilities Total payables and other liabilities Accounts Payable and Accrued Liabilities Business Combinations [Abstract] Schedule of Business Acquisitions Schedule of Business Acquisitions, by Acquisition [Table Text Block] Schedule of Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Pro Forma Information Business Acquisition, Pro Forma Information [Table Text Block] Mortgage Loans Held for Sale and Investment [Abstract] Mortgage Loans Held for Sale and Investment Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Mortgage Loans Held for Investment Mortgage Loans Held for Investment [Member] Mortgage Loans Held for Investment [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Non-accrual, UPB Mortgage Loans Held For Investment, Nonaccrual Basis, Unpaid Principal Balance Mortgage Loans Held For Investment, Nonaccrual Basis, Unpaid Principal Balance Non-accrual, Fair Value Mortgage Loans Held For Investment, Nonaccrual Basis, Fair Value Mortgage Loans Held For Investment, Nonaccrual Basis, Fair Value Income Tax Disclosure [Abstract] Amount Effective Income Tax Rate Reconciliation, Amount [Abstract] Tax (Benefit) Expense at Federal Statutory Rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Non-controlling interests Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Deferred adjustments Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Nondeductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Federal tax reform impact Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Current payable adjustments Effective Income Tax Rate Reconciliation, Current Payable Adjustments, Amount Effective Income Tax Rate Reconciliation, Current Payable Adjustments, Amount Adjustments related to uncertain tax positions Effective Income Tax Rate Reconciliation, Other Reconciling Items, Uncertain Tax Positions Effective Income Tax Rate Reconciliation, Other Reconciling Items, Uncertain Tax Positions Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Total income tax (benefit) expense Income Tax Expense (Benefit) Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Tax (Benefit) Expense at Federal Statutory Rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Non-controlling interests Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Deferred adjustments Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent Nondeductible items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Federal tax reform impact Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Current payable adjustments Effective Income Tax Rate Reconciliation, Current Payable Adjustments, Percent Effective Income Tax Rate Reconciliation, Current Payable Adjustments, Percent Adjustments related to uncertain tax positions Effective Income Tax Rate Reconciliation, Other Reconciling Items, Uncertain Tax Positions, Percent Effective Income Tax Rate Reconciliation, Other Reconciling Items, Uncertain Tax Positions, Percent Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Total income tax (benefit) expense Effective Income Tax Rate Reconciliation, Percent Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Loans Payable Loans Payable [Member] Notes Payable to Banks Notes Payable to Banks [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] CPRATE Corporate Rate (CPRATE) [Member] Corporate Rate (CPRATE) [Member] Mortgage Servicing Rights Mortgage Servicing Right [Member] Mortgage Servicing Right [Member] Mortgage loans held for sale and mortgage loans held for investment Loans Held-for-sale, Mortgages [Member] Loans Held-for-sale, Mortgages [Member] Reverse mortgage interests Reverse Mortgages [Member] Reverse Mortgages [Member] MSR Mortgage Servicing Rights and Other Collaterals [Member] Mortgage Servicing Rights and Other Collaterals [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Servicing Servicing Segment [Member] Servicing Segment [Member] Originations Originations Segment [Member] Originations Segment [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] $325 advance facility Nationstar Advance Agency Receivables Trust [Member] Nationstar Advance Agency Receivables Trust [Member] $250 advance facility NSM Advance Receivable Trust (2013) [Member] NSM Advance Receivable Trust (2013) [Member] $200 advance facility MBS Servicer Advance Facility (2014) [Domain] MBS Servicer Advance Facility (2014) [Domain] $125 advance facility Agency Advance Financing Facility (2011) [Member] Agency Advance Financing Facility (2011) [Member] $1,500 warehouse facility $1500 Warehouse Facility Due June 2020 [Member] $1500 Warehouse Facility Due June 2020 [Member] $1,200 warehouse facility Warehouse Facility $1.2 Billion [Member] Warehouse Facility $1.2 Billion [Member] $1,000 warehouse facility $1000 Warehouse Facility Due September 2017 [Member] $1000 Warehouse Facility Due September 2017 [Member] $800 warehouse facility $800 Warehouse Facility [Member] $800 Warehouse Facility [Member] $750 warehouse facility $750 Warehouse Facility Due September 2017 [Member] $750 Warehouse Facility Due September 2017 [Member] $700 warehouse facility Warehouse Facility $700 Million [Member] Warehouse Facility $700 Million [Member] $600 warehouse facility $600 Warehouse Facility [Member] $600 Warehouse Facility [Member] $500 warehouse facility $500 Million Warehouse Facility Due April 2019 [Member] $500 Million Warehouse Facility Due April 2019 [Member] $500 warehouse facility $500 Warehouse Facility Due September 2020 [Member] $500 Warehouse Facility Due September 2020 [Member] $200 warehouse facility $200 Million Warehouse Facility, Due January 2021 [Member] $200 Million Warehouse Facility, Due January 2021 [Member] $200 warehouse facility Warehouse Facility $200 Million [Member] Warehouse Facility $200 Million [Member] $200 warehouse facility $200 Million Warehouse Facility Due May 2020 [Member] $200 Million Warehouse Facility Due May 2020 [Member] $200 warehouse facility $200 Warehouse Facility, Due October 2020 [Member] $200 Warehouse Facility, Due October 2020 [Member] $50 warehouse facility $50 Warehouse Facility Due April 2020 [Member] $50 Warehouse Facility Due April 2020 [Member] $40 warehouse facility $40 Million Warehouse Facility, Due September 2020 [Member] $40 Million Warehouse Facility, Due September 2020 [Member] $40 warehouse facility $40 million Warehouse Facility [Member] $40 million Warehouse Facility [Member] $400 warehouse facility $400 Warehouse Facility, Due June 2021 [Member] $400 Warehouse Facility, Due June 2021 [Member] $400 warehouse facility $400 Warehouse Facility Due December 2020 [Member] $400 Warehouse Facility Due December 2020 [Member] $150 warehouse facility $150 Warehouse Facility Due April 2020 [Member] $150 Warehouse Facility Due April 2020 [Member] $50 warehouse facility $50 Warehouse Facility [Member] $50 Warehouse Facility [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Advance facilities Advance Facilities [Member] Advance Facilities [Member] Warehouse facilities Warehouse Facilities [Member] Warehouse Facilities [Member] MSR Facility MSR Facility [Member] MSR Facility [Member] Warehouse and MSR Facilities Warehouse and MSR Facilities [Member] Warehouse and MSR Facilities [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Capacity Amount Line of Credit Facility, Maximum Borrowing Capacity Outstanding Secured Debt, Gross Secured Debt, Gross Collateral Pledged Debt Instrument, Collateral Amount Unamortized debt issuance costs Debt Issuance Costs, Net Outstanding debt Secured Debt Interest Rate Debt Instrument, Basis Spread on Variable Rate Reverse Mortgage Interest [Abstract] Reverse Mortgage Interest [Abstract] Mortgage-backed debt Mortgages [Member] Participating interests in HECM mortgage-backed securities, including $10 and $58 purchase premium, respectively Reverse Mortgage Interest Subject to Non-Recourse Debt Reverse Mortgage Interest Subject to Non-Recourse Debt Other interests securitized, net of $56 and $100 purchase discount, respectively Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized Unsecuritized interests, net of $68 and $122 purchase discount, respectively Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized Reserves Reverse Funded Loan Advances, Reserves Reverse Funded Loan Advances, Reserves Total reverse mortgage interests, net Reverse Funded Loan Advances Reverse funded loan advances Unamortized premium Debt Instrument, Unamortized Premium Other interests securitized, purchase discounts Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized, Purchase Discount Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized, Purchase Discount Unsecuritized interests, purchase discount Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer relationships Customer Relationships [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Pacific Union Financial, LLC Pacific Union Financial, LLC [Member] Pacific Union Financial, LLC [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Restricted cash Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Restricted Cash And Equivalents Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Restricted Cash And Equivalents Mortgage servicing rights Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Mortgage Servicing Rights Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Mortgage Servicing Rights Advances and other receivables Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Advances And Other Receivables Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Advances And Other Receivables Mortgage loans held for sale Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Mortgage Loans Held For Sale Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Mortgage Loans Held For Sale Mortgage loans held for investment Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Mortgage Loans Held For Investment Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Mortgage Loans Held For Investment Property and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Other assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets Fair value of assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Note payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Advance facilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Advance Facilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Advance Facilities Warehouse facilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Warehouse Facilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Warehouse Facilities Payables and other liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Accounts Payable And Accrued Liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Accounts Payable And Accrued Liabilities Other nonrecourse debt Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Nonrecourse Debt Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Nonrecourse Debt Fair value of liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Total fair value of net tangible assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Goodwill Goodwill Final purchase price Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Useful life, assets acquired Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Condensed Financial Information Disclosure [Abstract] Schedule of Condensed Financial Statements [Table] Condensed Financial Statements [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Reportable legal entities Reportable Legal Entities [Member] Eliminations Consolidation, Eliminations [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Mr. Cooper Parent Company [Member] Issuer Subsidiary Issuer [Member] Guarantor (Subsidiaries of Issuer) Guarantor Subsidiaries [Member] Non-Guarantor (Subsidiaries of Issuer) Non-Guarantor Subsidiaries [Member] Condensed Financial Statements Condensed Financial Statements, Captions [Line Items] Assets Assets [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Restricted cash Restricted Cash and Cash Equivalents Mortgage servicing rights Servicing Asset Advances and other receivables, net Advances and Other Receivables, Net Advances and Other Receivables, Net Reverse mortgage interests, net Mortgage loans held for sale at fair value Mortgages Held-for-sale, Fair Value Disclosure Mortgage loans held for investment, net Mortgage Loans Held for Investment Subject to Nonrecourse Debt Legacy Assets Net Mortgage loans held for investment, subject to nonrecourse debt - Legacy Assets, net of allowance for loan losses, respectively Property and equipment, net Property, Plant and Equipment, Net Deferred tax assets, net Deferred Income Tax Assets, Net Other assets Other Assets Investment in subsidiaries Investment in Consolidated Subsidiaries Investment in Consolidated Subsidiaries Total assets Assets Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Unsecured senior notes, net Unsecured Debt Advance facilities, net Warehouse facilities, net Notes Payable, Fair Value Disclosure Payables and other liabilities MSR related liabilities - nonrecourse at fair value Mortgage Serving Rights Liability, carried at fair value Mortgage Serving Rights Liability, carried at fair value Mortgage servicing liabilities Servicing Liability at Amortized Cost, Balance Other nonrecourse debt, net Non-Recourse Debt Payables to affiliates Due to Affiliate Total liabilities Liabilities Total stockholders’ equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and stockholders’ equity Liabilities and Equity Share-based Payment Arrangement [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2012 Plan Two Thousand Twelve Plan [Member] 2012 Plan [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Restricted Stock Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning of Period (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Grants issued (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Ending of Period (shares) Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Beginning of Period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Grants issued (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Ending of Period (in dollars per share) Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Other Assets Other Assets Disclosure [Text Block] Receivables [Abstract] Schedule of Advances, Net Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Leases [Abstract] Operating cash flows from operating leases Operating Lease, Payments Leased assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Weighted average remaining lease term - operating leases, in years Operating Lease, Weighted Average Remaining Lease Term Weighted average discount rate - operating leases Operating Lease, Weighted Average Discount Rate, Percent Schedule of Payables and Accrued Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Schedule of Loans Subject to Repurchase Reserve Schedule of Loans Subject to Repurchase Reserve [Table Text Block] Schedule of Loans Subject to Repurchase Reserve [Table Text Block] Accounting Policies [Abstract] Derivative [Table] Derivative [Table] Derivative [Line Items] Derivative [Line Items] Mortgage loans held for investment Mortgage Loans Held For Investment Mortgage Loans Held For Investment Loan commitment period Loan Commitment Period Loan Commitment Period Mortgage loan sale period Mortgage Loan Sale Period Mortgage Loan Sale Period Number of reporting units Number of Reporting Units Advertising costs Marketing and Advertising Expense Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Unsecured Senior Notes Senior Notes [Member] $600 Senior Notes, 6% Senior Notes, $600 Face, 6% Due 2027 [Member] $600 6% Senior Notes Due 2027 [Member] $300 face value, 6.500% interest rate payable semi-annually, due June 2022 Unsecured Senior Notes Six Point Five Percent Due July 2022 [Member] Unsecured Senior Notes Six Point Five Percent Due July 2022 [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Face amount Debt Instrument, Face Amount Interest rate Debt Instrument, Interest Rate, Stated Percentage SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] WMIH Corp WMIH Corp [Member] WMIH Corp [Member] Nationstar Mortgage Holdings Inc. Nationstar Mortgage Holdings Inc. [Member] Nationstar Mortgage Holdings Inc. [Member] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Reserves for Advances and Other Receivables Advances and Other Receivables Reserves [Member] Advances and Other Receivables Reserves [Member] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Balance - beginning of period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Provision and other additions Valuation Allowances and Reserves, Additions Valuation Allowances and Reserves, Additions Write-offs SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Balance - end of period Provision for inactive and liquidated loans that are no longer part of the MSR portfolio Gain (Loss) On Advances And Other Receivables Related To Inactive And Liquidated Loans Gain (Loss) On Advances And Other Receivables Related To Inactive And Liquidated Loans Commitments and Contingencies Disclosure [Abstract] Mortgage Servicing Rights [Table] Mortgage Servicing Rights [Table] Mortgage Servicing Rights [Table] Reverse Mortgage Servicing Rights, Excluding Subservicing Reverse Mortgage Servicing Rights, Excluding Subservicing [Member] Reverse Mortgage Servicing Rights, Excluding Subservicing [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Litigation and Regulatory Matters Litigation and Regulatory Matters [Member] Litigation and Regulatory Matters [Member] Mortgage Servicing Rights [Line Items] Mortgage Servicing Rights [Line Items] Mortgage Servicing Rights [Line Items] Legal fees Legal Fees Reasonably possible loss Loss Contingency, Estimate of Possible Loss Operating lease, rent expense Operating Lease, Expense Rental expense Operating Leases, Rent Expense Principal amount outstanding on mortgage servicing rights Principal Amount Outstanding on Loans Managed and Securitized or Asset-backed Financing Arrangement Maximum unfunded advance obligation Off-balance Sheet, Maximum Advance Obligation of Reverse Mortgages Serviced Off-balance Sheet, Maximum Advance Obligation of Reverse Mortgages Serviced Fair Value Disclosures [Abstract] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Mortgage servicing rights Mortgage loans held for investment Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Excess spread financing Excess Spread Financing [Member] Excess Spread Financing [Member] Mortgage servicing rights financing Mortgage Servicing Right Liability [Member] Mortgage Servicing Right Liability Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Balance - beginning of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Total gains or losses included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Payments received from borrowers Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Payments From Borrowers Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Payments From Borrowers Purchases, issuances, sales, repayments and settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) [Abstract] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Repayments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Repayments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Repayments Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Transfers to mortgage loans held for sale Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfer To Mortgage Loans Held For Sale Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfer To Mortgage Loans Held For Sale Transfers to real estate owned Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfer To Real Estate Owned Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfer To Real Estate Owned Changes in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) Balance - end of period Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Balance - beginning of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Total gains or losses included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Payments received from borrowers Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments From Borrowers Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments From Borrowers Purchases, issuances, sales, repayments and settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases, (Sales), Issuances, (Settlements) [Abstract] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Issuances Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Repayments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Repayments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Repayments Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Transfers to mortgage loans held for sale Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfer To Mortgage Loans Held For Sale Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfer To Mortgage Loans Held For Sale Transfers to real estate owned Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfer To Real Estate Owned Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfer To Real Estate Owned Changes in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) Balance - end of period Subsequent Events Subsequent Events [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Technology Software and Software Development Costs [Member] Trade name Trade Names [Member] Other Other Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Carrying Amount Finite-Lived Intangible Assets, Net Weighted Average Remaining Life in Years Finite-Lived Intangible Asset, Useful Life Participating interest financing Participating Interest Financing [Member] Participating Interest Financing [Member] Trust 2019-2 2019-02 HECM Securitization [Member] 2019-02 HECM Securitization [Member] Trust 2019-1 2019-01 HECM Securitization [Member] 2019-01 HECM Securitization [Member] Trust 2018-3 2018-03 HECM Securitization [Member] 2018-03 HECM Securitization [Member] Trust 2018-2 2018-02 HECM Securitization [Member] 2018-02 HECM Securitization [Member] Trust 2018-1 2018-01 HECM Securitization [Member] 2018-01 HECM Securitization [Member] Trust 2017-2 2017-02 HECM Securitization [Member] 2017-02 HECM Securitization [Member] Legacy Asset Legacy Asset [Member] Legacy Asset [Member] Other Other [Member] Other [Member] Collateral Amount Non-recourse debt Unamortized debt issuance costs, premium and discount Acquisitions Business Combination Disclosure [Text Block] Segment Reporting [Abstract] Business Segment Reporting Segment Reporting Disclosure [Text Block] Transfers and Servicing [Abstract] Schedule of Servicing Assets at Fair Value Schedule of Servicing Assets at Fair Value [Table Text Block] Schedule of Assumptions for Fair Value of Mortgage Service Rights Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table Text Block] Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block] Schedule of Fees Earned in Exchange for Servicing Financial Assets Schedule of Fees Earned in Exchange for Servicing Financial Assets [Table Text Block] Schedule of Fees Earned in Exchange for Servicing Financial Assets [Table Text Block] WMIH Corp And Wand Merger Corporation WMIH Corp And Wand Merger Corporation [Member] WMIH Corp And Wand Merger Corporation [Member] Converted WMIH common shares (in shares) Conversion of Stock, Shares Converted Price per share (in dollars per share) Business Acquisition, Share Price Purchase price from common stock issued Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Purchase price from cash payment Payments to Acquire Businesses, Gross Total purchase price Business Combination, Consideration Transferred Reverse stock split ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Share price Share Price Schedule of Other Assets Schedule of Other Assets [Table Text Block] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Schedule of Intangible Assets and Goodwill Schedule of Intangible Assets and Goodwill [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Pro forma total revenues Business Acquisition, Pro Forma Revenue Pro forma net income Business Acquisition, Pro Forma Net Income (Loss) Repurchased HECM loans (exceed 98% MCA) Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Repurchase of Home Equity Conversion Mortgages Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Repurchase of Home Equity Conversion Mortgages HECM related receivables Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Home Equity Conversion Mortgage Receivables Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Home Equity Conversion Mortgage Receivables Funded borrower draws not yet securitized Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Funded Draws Not Yet Securitized Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Funded Draws Not Yet Securitized REO-related receivables Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Real Estate Owned Related Receivables Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Real Estate Owned Related Receivables Purchase discount Total unsecuritized interests Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Unrecognized Tax Benefits Roll Forward Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Variable Interest Entities and Securitizations [Abstract] Variable Interest Entities and Securitizations Schedule of Assets and Associated Liabilities Accounted for as Secured Borrowings [Table] Schedule of Assets and Associated Liabilities Accounted for as Secured Borrowings [Table] Residential Mortgage Residential Mortgage [Member] Other nonrecourse debt Nonrecourse Debt [Member] Nonrecourse Debt Legacy Assets [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Restricted cash Restricted Cash [Member] Restricted Cash [Member] Advances and other receivables, net Accounts Receivable [Member] Other assets Other Assets [Member] Advance facilities Notes Payable [Member] Notes Payable [Member] Payables and other liabilities Accounts Payable and Accrued Liabilities [Member] HECM Securitizations (HMBS) Other Non-Recourse Debt [Member] Other Non-Recourse Debt Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] Number Of VIEs Number Of Variable Interest Entities Number Of Variable Interest Entities Transfers accounted for as secured borrowings, assets Transfers Accounted for as Secured Borrowings, Assets, Carrying Amount Reverse secured borrowings, assets Reverse Secured Borrowings, Assets, Carrying Amount Reverse Secured Borrowings, Assets, Carrying Amount Transfers accounted for as secured borrowings, liabilities Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount Reverse secured borrowings, liabilities Reverse Secured Borrowings, Liabilities, Carrying Amount Reverse Secured Borrowings, Liabilities, Carrying Amount UPB, purchase discount Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount Reverse Mortgage Interests [Abstract] Reverse Mortgage Interests [Abstract] Participating Interests in HMBS Participating Interests in HMBS [Member] Participating Interests in HMBS [Member] Government National Mortgage Association (GNMA) Insured Loans Government National Mortgage Association (GNMA) Insured Loans [Member] Trust 2019-1 and Trust 2019-2 Trust 2019-1 and Trust 2019-2 [Member] Trust 2019-1 and Trust 2019-2 [Member] Trust 2017-2 and Trust 2018-1 Trust 2017-2 and Trust 2018-1 [Member] Trust 2017-2 and Trust 2018-1 [Member] Trust 2017-1 2017-01 HECM Securitization [Member] 2017-01 HECM Securitization [Member] Trust 2018-1 and Trust 2018-2 Trust 2018-1 and Trust 2018-2 [Member] Trust 2018-1 and Trust 2018-2 [Member] Trust 2016-2 and Trust 2016-3 Trust 2016-2 and Trust 2016-3 [Member] Trust 2016-2 and Trust 2016-3 [Member] Reverse Mortgage Interests, Unsecuritized Reverse Mortgage Interests, Unsecuritized [Member] Reverse Mortgage Interests, Unsecuritized [Member] Housing And Urban Development, Home Equity Conversion Mortgage Loans Housing And Urban Development, Home Equity Conversion Mortgage Loans [Member] Housing And Urban Development, Home Equity Conversion Mortgage Loans [Member] Other Interest Securitized and Unsecuritized Interests Other Interest Securitized And Unsecuritized Interests [Member] Other Interest Securitized And Unsecuritized Interests [Member] HECM HECM [Member] HECM [Member] Unsecuritized HECM Unsecuritized HECM [Member] Unsecuritized HECM [Member] UPB securitized Reverse Mortgage Interest, Unpaid Principal Balance, Securitized Reverse Mortgage Interest, Unpaid Principal Balance, Securitized Unpaid principal balance sold Reverse Mortgage Interest, Unpaid Principal Balance, Sold Reverse Mortgage Interest, Unpaid Principal Balance, Sold Repurchase of HECM loans Reverse Mortgage Interest, Unsecuritized, Repurchase of Home Equity Conversion Mortgages Reverse Mortgage Interest, Unsecuritized, Repurchase of Home Equity Conversion Mortgages Repurchase of HECM loans funded by prior servicer Reverse Mortgage Interest, Unsecuritized, Repurchase of Home Equity Conversion Mortgages Funded by Prior Servicer Reverse Mortgage Interest, Unsecuritized, Repurchase of Home Equity Conversion Mortgages Funded by Prior Servicer HECM loans assigned to HUD Reverse Mortgage Interest, Unpaid Principal Balance Assigned, Unsecuritized Reverse Mortgage Interest, Unpaid Principal Balance Assigned, Unsecuritized Interest earned on HECM loans Interest and Fee Income, Loans Held-for-sale, Mortgages Earnings Per Share [Abstract] Earnings per Share Earnings Per Share [Text Block] Indebtedness Debt Disclosure [Text Block] Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Subsidiary of New Residential Subsidiary of New Residential [Member] Subsidiary of New Residential [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Loan Subservicing Agreement Loan Subservicing Agreement [Member] Loan Subservicing Agreement [Member] Agency MSRs Agency MSRs [Member] Agency MSRs [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] New Residential New Residential [Member] New Residential Related Party Transaction [Line Items] Related Party Transaction [Line Items] Payments for servicing fees Payments for Servicing Fees Payments for Servicing Fees Service related, net Fees and Commissions, Mortgage Banking and Servicing Revenue recognized for serving arrangements Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets, Revenue Recognized Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets, Revenue Recognized Mortgage Banking [Abstract] Capital Requirements Regulatory Capital Requirements for Mortgage Companies Disclosure [Text Block] Retirement Benefits [Abstract] Employee Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Operating lease cost Operating Lease, Cost Short-term lease cost Short-term Lease, Cost Sublease income Sublease Income Net lease cost Lease, Cost Organization, Consolidation and Presentation of Financial Statements [Abstract] Nature of Business and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Reverse Mortgage Interests, Net Reverse Mortgage Interest Disclosure [Text Block] Reverse Mortgage Interest Disclosure [Text Block] Reverse funded loan advances [Table] Schedule of Servicing Assets at Fair Value [Table] Corporate and Other Corporate and Other [Member] Trust 2009-A, Legacy Portfolio Trust 2009-A, Legacy Portfolio [Member] Trust 2009-A, Legacy Portfolio [Member] Servicing Assets at Fair Value [Line Items] Servicing Assets at Fair Value [Line Items] Mortgage loans held for sale in foreclosure Mortgage Loans in Process of Foreclosure, Amount Sale of mortgage loans held for sale Proceeds from Sale of Mortgage Loans Held-for-sale Gain on sale of mortgage loans held for sale Gain on Sale of Mortgage Loans Gain on Sale of Mortgage Loans Net gain on mortgage loans held for sale Gain (Loss) on Sales of Loans, Net Sale of mortgage loans Transfers to mortgage loans held for sale Transfers to real estate owned Mortgage loans held for investment in foreclosure Mortgage Loans Held for Investment in foreclosure, amount mortgage loans held for investment in foreclosure, amount 2020 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2023 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2024 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Property, Plant and Equipment [Abstract] Summary of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] IRLCs Interest Rate Lock Commitments [Member] Forward MBS trades Forward Contracts [Member] LPCs Loan Purchase Commitments [Member] Eurodollar futures Eurodollar Future [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Recurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] ASSETS Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Mortgage loans held for investment at fair value Mortgage servicing rights Servicing Asset at Fair Value, Amount Derivative financial instruments Derivative Asset, Fair Value, Gross Asset Total assets Assets, Fair Value Disclosure LIABILITIES Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Derivative financial instruments Derivative Liability, Fair Value, Gross Liability Mortgage servicing rights financing liability Mortgage Servicing Rights Liability Resulting from Sale of Servicer Advances, Rights not Accounted for as a Sale Mortgage Servicing Rights Liability Resulting from Sale or Securitization of Servicer Advances, Rights not Accounted for as a Sale Excess spread financing Excess Spread Financing at Fair Value Excess spread financing (at fair value) Total liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Derivative instrument, fair value (less than) Derivative Instruments in Hedges, at Fair Value, Net Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Shell Company Entity Shell Company Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Common Stock, Shares Outstanding (shares) Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Eliminations Intersegment Eliminations [Member] Total Operating Segments Operating Segments [Member] Corporate/ Other Corporate, Non-Segment [Member] Xome Xome Segment [Member] Xome Segment [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of reportable segments Number of Reportable Segments Segment Reporting Information, Profit (Loss) [Abstract] Segment Reporting Information, Profit (Loss) [Abstract] Revenues: Revenues [Abstract] Net gain on mortgage loans held for sale Total revenues Revenues Total expenses Operating Expenses Other income (expenses), net: Nonoperating Income (Expense) [Abstract] Interest income Interest Income, Other Interest expense Interest Expense Other (expenses) income, net Other Nonoperating Income (Expense) Total other income (expenses), net Nonoperating Income (Expense) (Loss) income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Depreciation and amortization for property and equipment and intangible assets Depreciation, Depletion and Amortization Total assets Statement of Financial Position [Abstract] Mortgage servicing rights, $3,496 and $3,665 at fair value, respectively Advances and other receivables, net of reserves of $175 and $47, respectively Reverse mortgage interests, net of reserves of $3 and $13, respectively Property and equipment, net of accumulated depreciation of $55 and $16, respectively Liabilities and Stockholders’ Equity Unsecured senior notes, net Advance facilities, net Warehouse facilities, net Payables and other liabilities Other nonrecourse debt, net Commitments and contingencies (Note 21) Commitments and Contingencies Preferred stock at $0.00001 - 10 million shares authorized, 1 million shares issued and outstanding, respectively; aggregate liquidation preference of ten dollars, respectively Preferred Stock, Value, Issued Common stock at $0.01 par value - 300 million authorized, 91.1 million and 90.8 million shares issued, respectively Common Stock, Value, Issued Additional paid-in-capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Total Mr. Cooper stockholders’ equity Stockholders' Equity Attributable to Parent Non-controlling interests Stockholders' Equity Attributable to Noncontrolling Interest Total stockholders’ equity Premium for Participating Interests in HMBS Debt Premium Rollforward [Roll Forward] Debt Premium Rollforward [Roll Forward] Balance - beginning of period Adjustments Debt Instrument, Debt Premium, Additions Debt Instrument, Debt Premium, Additions Utilization of purchase discounts Debt Instrument, Debt Premium, Utilization Of Purchase Discounts Debt Instrument, Debt Premium, Utilization Of Purchase Discounts Accretion/(Amortization) Amortization of Debt Discount (Premium) Transfers Debt Instrument, Debt Premium, Transfer Debt Instrument, Debt Premium, Transfer Balance - end of period Discount for Unsecuritized Interests Unsecuritized Interests Rollforward [Roll Forward] Unsecuritized Interests Rollforward [Roll Forward] Balance - beginning of period Adjustments Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized, Purchase Discount, Additions Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized, Purchase Discount, Additions Utilization of purchase discounts Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized, Purchase Discount, Utilization Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized, Purchase Discount, Utilization Accretion/(Amortization) Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized, Purchase Discount, Accretion (Amortization) Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized, Purchase Discount, Accretion (Amortization) Transfers Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized, Purchase Discount, Transfer Reverse Mortgage Interest, Unpaid Principal Balance, Other Interests Securitized, Purchase Discount, Transfer Balance - end of period Discount for Other Interest Securitized Other Interest Securitized Rollforward [Roll Forward] Other Interest Securitized Rollforward [Roll Forward] Balance - beginning of period Adjustments Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount, Additions Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount, Additions Utilization of purchase discounts Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount, Utilization Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount, Utilization Accretion/(Amortization) Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount, Accretion Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount, Accretion Transfers Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount, Transfer Reverse Mortgage Interest, Unpaid Principal Balance, Unsecuritized, Purchase Discount, Transfer Balance - end of period Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustment to reconcile net income (loss) to net cash attributable to operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Deferred tax (benefit) expense Deferred Income Tax Expense (Benefit) (Gain) loss from subsidiaries Intercompany Gains (Losses) Intercompany Gains (Losses) Net gain on mortgage loans held for sale Interest income on reverse mortgage loans Interest Income, Reverse Mortgages Interest Income, Reverse Mortgages Loss (gain) on sale of assets Gain (Loss) on Disposition of Assets MSL related increased obligation Mortgage Servicing Liability, Increase (Decrease) In Obligation Mortgage Servicing Liability, Increase (Decrease) In Obligation Provision for servicing reserves Provision for Reserves on Advance and Other Receivables Provision for Reserves on Advance and Other Receivables Fair value changes and amortization/accretion of mortgage servicing rights/liabilities Mortgage Servicing Rights (MSR) Impairment (Recovery) Fair value changes in excess spread financing Fair Value Changes in Excess Financing Spread Fair value changes in excess spread financing Fair value changes in mortgage servicing rights financing liability Fair Value Changes in MSR Financing Liability Fair Value Changes in mortgage servicing rights financing liability Fair value changes in mortgage loans held for investment Mortgage Loans Held For Investment, Change In Fair Value Mortgage Loans Held For Investment, Change In Fair Value Amortization of premiums, net of discount accretion Accretion (Amortization) of Discounts and Premiums, Investments Depreciation and amortization for property and equipment and intangible assets Share-based compensation Share-based Payment Arrangement, Noncash Expense Other loss Operating Activities, Other Income (Loss) Operating Activities, Other Income (Loss) Repurchases of forward loan assets out of Ginnie Mae securitizations Increase (Decrease) in Receivables under Repurchase Agreements Mortgage loans originated and purchased for sale, net of fees Payments for Origination and Purchases of Loans Held-for-sale Sales proceeds and loan payment proceeds for mortgage loans held for sale and held for investment Proceeds From Sale And Other Changes In Mortgage Loan Held For Sale Proceeds from sale and other changes in mortgage loan held for sale. Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Advances and other receivables Increase (Decrease) in Accounts Receivable Reverse mortgage interests Increase Decrease in Reverse Funded Advances Due to Securitization Reverse funded advances due to securitization Other assets Increase (Decrease) in Other Operating Assets Payables and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Net cash attributable to operating activities Net Cash Provided by (Used in) Operating Activities Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Property and equipment additions, net of disposals Payments for (Proceeds from) Productive Assets Purchase of forward mortgage servicing rights, net of liabilities incurred Payments to Acquire Mortgage Servicing Rights (MSR) Net proceeds from acquisition of reverse mortgage servicing portfolio and HECM related receivables Payments for Reverse Mortgage Interests, Net of Participations Sold Payments for Reverse Mortgage Interests, Net of Participations Sold Proceeds on sale of forward and reverse mortgage servicing rights Proceeds from Sale of Mortgage Servicing Rights (MSR) Purchase of forward mortgage servicing rights, net of liabilities incurred Payments (Proceeds) To Acquire Mortgage Servicing Rights (MSR) Payments (Proceeds) To Acquire Mortgage Servicing Rights (MSR) Net payment related to acquisition of HECM related receivables Net Payments (Proceeds) Related To Acquisitions Of HECM Related Receivables Net Payments (Proceeds) Related To Acquisitions Of HECM Related Receivables Proceeds on sale of assets Proceeds from Sale of Productive Assets Purchase of cost-method investment Payments To Acquire Cost Method Investments Payments To Acquire Cost Method Investments Net cash attributable to investing activities Net Cash Provided by (Used in) Investing Activities Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Increase (decrease) in warehouse facilities Proceeds from (Repayments of) Secured Debt Decrease in advance facilities Proceeds from (Repayments of) Lines of Credit Repayment of notes payable Repayments of Notes Payable Proceeds from issuance of HECM securitizations Proceeds from Other Debt Proceeds from sale of HECM securitizations Proceeds From Sale Of Home Equity Conversion Mortgages Proceeds From Sale Of Home Equity Conversion Mortgages Repayment of HECM securitizations Repayments of Other Debt Proceeds from issuance of participating interest financing Proceeds From Issuance Of Participating Interest Financing In Reverse Mortgage Interests, Net Proceeds From Issuance Of Participating Interest Financing In Reverse Mortgage Interests, Net Repayment of participating interest financing Proceeds from (Payments for) Mortgage Backed Securities Notes Payable Proceeds from (Payments for) Mortgage Backed Securities Notes Payable Proceeds from issuance of excess spread financing Proceeds from Excess Spread Financing Proceeds from Excess Spread Financing Repayment of excess spread financing Repayment of Excess Servicing Spread Financing Repayment of excess servicing spread financing Settlement of excess spread financing Payment For Settlement Of Excess Servicing Spread Financing Payment For Settlement Of Excess Servicing Spread Financing Repayment of nonrecourse debt - legacy assets Repayment of Nonrecourse Debt Legacy Assets Repayment of nonrecourse debt - Legacy assets Repurchase of unsecured senior notes Payment for Repurchase of Unsecured Debt Payment for Repurchase of Unsecured Debt Redemption and repayment of unsecured senior notes Repayments of Unsecured Debt Repayment of finance lease liability Finance Lease, Principal Payments Surrender of shares relating to stock vesting Payment, Tax Withholding, Share-based Payment Arrangement Repayment of finance lease liability Payments for Repurchase of Common Stock Proceeds from non-controlling interests Proceeds from Noncontrolling Interests Debt financing costs Payments of Financing Costs Dividends to non-controlling interests Payments of Ordinary Dividends, Noncontrolling Interest Net cash attributable to financing activities Net Cash Provided by (Used in) Financing Activities Net decrease in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash and cash equivalents - beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents - end of year Mortgage loans held for investment at fair value Mortgage Loans Held For Sale And Investment [Roll Forward] Mortgage Loans Held For Sale And Investment [Roll Forward] Balance - beginning of period Sale of mortgage loans Transfers to mortgage loans held for sale Payments received from borrowers Proceeds From Collection Of Mortgage Loans Held For Investment Proceeds From Collection Of Mortgage Loans Held For Investment Transfers to real estate owned Changes in fair value Charge-offs Mortgage Loans Held For Investment, Losses Incurred Mortgage Loans Held For Investment, Losses Incurred Balance - end of period Statement [Table] Statement [Table] $600 face value, 6.500% interest rate payable semi-annually, due July 2021 Unsecured Senior Notes Six Point Five Percent Due July 2021 [Member] Unsecured Senior Notes 6.5% Due July 2021 Statement [Line Items] Statement [Line Items] Unsecured senior notes principal amount Unsecured Debt, Gross Unsecured Debt, Gross Ownership percentage Guarantor Subsidiary, Ownership Percentage Guarantor Subsidiary, Ownership Percentage Number of direct wholly owned subsidiaries Number of Subsidiaries as Guarantors of Unsecured Debt Number of Subsidiaries as Guarantors of Unsecured Debt Derivative Instruments and Hedging Activities Disclosure [Abstract] Schedule of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Receivable discount Receivable with Imputed Interest, Discount Purchase discount utilized Receivable Discount, Accumulated Utilization and Accretion Receivable Discount, Accumulated Utilization and Accretion Statement of Cash Flows [Abstract] Cash and cash equivalents Total cash, cash equivalents and restricted cash Tax Credit Carryforward [Table] Tax Credit Carryforward [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Federal Domestic Tax Authority [Member] Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Operating loss carryforwards, valuation allowance Operating Loss Carryforwards, Valuation Allowance Deferred tax assets, NOL Deferred Tax Assets, Operating Loss Carryforwards Operating loss carryforwards Operating Loss Carryforwards Unrecognized tax benefits Unrecognized Tax Benefits Unrecognized tax benefits, uncertain tax positions Unrecognized Tax Benefits, Period Increase (Decrease) Interest and penalties expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Unrecognized tax benefits, net effect Unrecognized Tax Benefits that Would Impact Effective Tax Rate Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, Nonrecurring Fair Value, Nonrecurring [Member] Trust 2018-2 Trust 2018-1 Nonrecourse debt - legacy assets Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial assets Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Advances and other receivables, net Services Advances, Net, Fair Value Disclosure Services Advances, Net, Fair Value Disclosure Mortgage loans held for sale Financial liabilities Excess spread financing Excess Spread Financing, Fair Value Disclosure Excess Spread Financing, Fair Value Disclosure Derivative financial instruments Derivative Liability Securitizations and Financings Variable Interest Entities and Securitizations [Text Block] Variable Interest Entities and Securitizations Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table] Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Table] Weighted Average Assumption [Axis] Weighted Average Assumption [Axis] Weighted Average Assumption [Axis] Weighted Average Assumption [Domain] Weighted Average Assumption [Domain] [Domain] for Weighted Average Assumption [Axis] Financing rates Financing rates [Member] financing rates Recovery rates Recovery rates [Member] Recovery rates Excess Spread Financing MSR Financing Liability MSR Financing Liability [Member] MSR Financing Liability Servicing Assets and Servicing Liabilities Risk [Axis] Servicing Assets and Servicing Liabilities Risk [Axis] Risks Inherent in Servicing Assets and Servicing Liabilities, Type [Domain] Risks Inherent in Servicing Assets and Servicing Liabilities, Type [Domain] Credit sensitive Credit Risk [Member] Interest sensitive Interest Rate Risk [Member] Assumption for Fair Value of Mortgage Servicing Rights Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items] Discount rate Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate Prepayment speeds Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed Expected weighted-average life (in years) Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected weighted-average life Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected weighted-average life Discount rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Discount Rate Prepayment speeds Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Prepayment Speed Recapture rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Recapture Rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Recapture Rate Average life Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Weighted Average Life Advance financing rates Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Advanced Financing Rate Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Advanced Financing Rate Annual advance recovery rates Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Annual Advanced Recovery Rates Assumption for Fair Value of Assets or Liabilities that relate to Transferor's Continuing Involvement, Annual Advanced Recovery Rates Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward] Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward] Balance - beginning of period Loans Receivable Held-for-sale, Amount Loans sold Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Deductions from Held-for-sale Mortgage loans originated and purchased, net of fees Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Additions to Held-for-sale Repurchase of loans out of Ginnie Mae securitizations Repurchase of Ginnie Mae Receivables Repurchase of Ginnie Mae Receivables Net transfer of mortgage loans held for sale (to)/from REO in other assets Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Transfer from Held-for-sale to Held For Investment or Other Assets Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Transfer from Held-for-sale to Held For Investment or Other Assets Changes in fair value Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Changes in Fair Value Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Changes in Fair Value Other purchase-related activities Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Other Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Other Transfer of mortgage loans held for sale to advances and other receivables, net related to claims Claims Made to Third Parties Claims Made to Third Parties Balance - end of period Mortgage Servicing Rights and Related Liabilities Transfers and Servicing of Financial Assets [Text Block] Mortgage Servicing Right Liability Forward MSRs - fair value Reverse MSRs - amortized cost Servicing Asset at Amortized Cost Mortgage servicing rights Mortgage servicing liabilities - amortized cost Excess spread financing - fair value Mortgage servicing rights financing - fair value MSR related liabilities - nonrecourse at fair value Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Operating lease, contract term Lessee, Operating Lease, Term of Contract Operating lease, renewal term Lessee, Operating Lease, Renewal Term Right-of-use assets Operating Lease, Right-of-Use Asset Accretion/(Amortization) Purchase discounts for reverse mortgage interests Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount Rollforward [Roll Forward] Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount Rollforward [Roll Forward] Balance - beginning of period Additions Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount, Additions Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount, Additions Accretion Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount, Accretion Reverse Mortgage Interest, Unpaid Principal Balance, Purchase Discount, Accretion Balance - end of period Loans subject to repurchase right from Ginnie Mae Assets Sold Under Agreements to Repurchase, Loan Receivable Assets Sold Under Agreements to Repurchase, Loan Receivable Trade receivables and accrued revenues Servicing Fees Receivable Servicing Fees Receivable Intangible assets Intangible Assets, Net (Excluding Goodwill) Other Other Assets, Miscellaneous Total other assets Statement of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Preferred Stock Preferred Stock [Member] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Retained Earnings Retained Earnings [Member] Treasury Shares Amount Treasury Stock [Member] Total Nationstar Stockholders’ Equity and Mr. Cooper Stockholders’ Equity, respectively Parent [Member] Non-controlling Interests Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance (in shares) Shares, Outstanding Beginning balance Non-controlling interests acquired Noncontrolling Interest, Increase from Business Combination Shares issued / (surrendered) under incentive compensation plan (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Shares issued / (surrendered) under incentive compensation plan Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Share-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Dividends to non-controlling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Ending balance Ending balance (in shares) Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Basis of Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Recent Accounting Guidance Adopted and Recent Accounting Guidance Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Mortgage Servicing Rights (MSRs) Mortgage Banking Activity [Policy Text Block] Advances and Other Receivables, Net