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Statement - CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 1004000 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 1004501 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 2419401 - Disclosure - Debt - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2110100 - Disclosure - Derivative Financial Instruments link:presentationLink link:calculationLink link:definitionLink 2410409 - Disclosure - Derivative Financial Instruments - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2410404 - Disclosure - Derivative Financial Instruments Fair Value Hedges Carrying Amount of Hedged Assets and Liabilities and Cumulative Basis Adjustments (Details) link:presentationLink link:calculationLink link:definitionLink 2410406 - Disclosure - Derivative Financial Instruments Location of Gains and Losses Designated as Hedging Instruments, Consolidated Statements of Income (Details) link:presentationLink link:calculationLink link:definitionLink 2410402 - Disclosure - Derivative Financial Instruments Nature and Amount of Collateral Received From and Posted To Our Derivative Counterparties (Details) link:presentationLink link:calculationLink link:definitionLink 2310301 - Disclosure - Derivative Financial Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 2409404 - Disclosure - Distribution of the Maturity Dates for Fixed Maturity Securities (Detail) link:presentationLink link:calculationLink link:definitionLink 0001000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 2115100 - Disclosure - Employee Benefit Plans link:presentationLink link:calculationLink link:definitionLink 2415402 - Disclosure - Employee Benefit Plans Net Periodic Benefit Cost (Detail) link:presentationLink link:calculationLink link:definitionLink 2315301 - Disclosure - Employee Benefit Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 2408403 - Disclosure - Fair Value Measurements by Fair Value Heirarchy Input Level (Detail) link:presentationLink link:calculationLink link:definitionLink 2408408 - Disclosure - Fair Value of Financial Instruments Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2108100 - Disclosure - Fair Values of Financial Instruments link:presentationLink link:calculationLink link:definitionLink 2408407 - Disclosure - Fair Values of Financial Instruments Carrying Amounts and Estimated Fair Value of Financial Instruments Not Measured at Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 2408402 - Disclosure - Fair Values of Financial Instruments Private Equity Partnerships (Details) link:presentationLink link:calculationLink link:definitionLink 2308301 - Disclosure - Fair Values of Financial Instruments (Tables) link:presentationLink link:calculationLink link:definitionLink 2410408 - Disclosure - Gains and Losses on Derivatives Not Designated as Hedging Instruments (Detail) link:presentationLink link:calculationLink link:definitionLink 2109100 - Disclosure - Investments link:presentationLink link:calculationLink link:definitionLink 2409414 - Disclosure - Investments - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2409402 - Disclosure - Investments Amortized Cost and Fair Values of Securities by Security Type (Detail) link:presentationLink link:calculationLink link:definitionLink 2409405 - Disclosure - Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) link:presentationLink link:calculationLink link:definitionLink 2409410 - Disclosure - Investments Federal Home Loan Bank Carrying Amount, Collateral Posted and Advances Received (Details) link:presentationLink link:calculationLink link:definitionLink 2409406 - Disclosure - Investments Low Income Housing Tax Credits (Details) link:presentationLink link:calculationLink link:definitionLink 2409409 - Disclosure - Investments Remaining Contractual Maturity of Securities Lending Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 2309301 - Disclosure - Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 2409403 - Disclosure - Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) link:presentationLink link:calculationLink link:definitionLink 2113100 - Disclosure - Liability for Unpaid Claims and CAE Liability for Unpaid Claims link:presentationLink link:calculationLink link:definitionLink 2413404 - Disclosure - Liability for Unpaid Claims and CAE Liability for Unpaid Claims - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2413402 - Disclosure - Liability for Unpaid Claims and CAE Liability for Unpaid Claims and Claim Adjustment Expenses (Details) link:presentationLink link:calculationLink link:definitionLink 2313301 - Disclosure - Liability for Unpaid Claims and CAE Liability for Unpaid Claims (Tables) link:presentationLink link:calculationLink link:definitionLink 2413403 - Disclosure - Liability for Unpaid Claims and CAE Reconciliation of Policy and Contract Benefits and Reserves for Future Policy and Contract Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 2410405 - Disclosure - Location and Fair Values of Derivative Financial Instruments (Detail) link:presentationLink link:calculationLink link:definitionLink 2410407 - Disclosure - Location of Gains and Losses on Derivative Financial Instruments Designated as Hedging Instruments (Detail) link:presentationLink link:calculationLink link:definitionLink 2409407 - Disclosure - Mortgage Loans by Property Type and Geographic Region (Detail) link:presentationLink link:calculationLink link:definitionLink 2409408 - Disclosure - Mortgage Loans Sorted by Applicable Internal Credit Ratings and Loan-to-Value Ratios (Detail) link:presentationLink link:calculationLink link:definitionLink 2416402 - Disclosure - Net Income (Loss) Per Common Share (Detail) link:presentationLink link:calculationLink link:definitionLink 2409412 - Disclosure - Net Investment Income (Detail) link:presentationLink link:calculationLink link:definitionLink 2410403 - Disclosure - Notional Amounts for Each Category of Derivative Activity (Detail) link:presentationLink link:calculationLink link:definitionLink 2119100 - Disclosure - Other link:presentationLink link:calculationLink link:definitionLink 2419402 - Disclosure - Other Income Tax - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2414402 - Disclosure - Premium Income by Major Line of Business within Each Segment (Detail) link:presentationLink link:calculationLink link:definitionLink 2408406 - Disclosure - Quantitative Information Regarding Significant Unobservable Inputs (Details) link:presentationLink link:calculationLink link:definitionLink 2409413 - Disclosure - Realized Investment Gains and Losses Reported in Consolidated Statements of Income (Detail) link:presentationLink link:calculationLink link:definitionLink 2414405 - Disclosure - Reconciliation of Total Revenue and Income (Loss) before Income Tax by Segment to Adjusted Operating Revenue and Adjusted Operating Income (Detail) link:presentationLink link:calculationLink link:definitionLink 2412402 - Disclosure - Schedule of Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 2412403 - Disclosure - Schedule of Components of Unrealized Gain (Loss) on Securities (Details) link:presentationLink link:calculationLink link:definitionLink 2409411 - Disclosure - Schedule of Financial Instrument and Derivative Offsetting (Details) link:presentationLink link:calculationLink link:definitionLink 2412404 - Disclosure - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 2114100 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 2414406 - Disclosure - Segment Information Segment Information - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2314301 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 2414403 - Disclosure - Selected Operating Statement Data by Segment (Detail) link:presentationLink link:calculationLink link:definitionLink 2116100 - Disclosure - Stockholders' Equity and Earnings (Loss) Per Common Share link:presentationLink link:calculationLink link:definitionLink 2316301 - Disclosure - Stockholders' Equity and Earnings (Loss) Per Common Share (Tables) link:presentationLink link:calculationLink link:definitionLink 2416403 - Disclosure - Stockholders' Equity and Earnings (Loss) Per Common Share Treasury Stock Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 2416404 - Disclosure - Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) link:presentationLink link:calculationLink link:definitionLink 2408404 - Disclosure - Transfers of Assets between Level 1 and Level 2 (Detail) link:presentationLink link:calculationLink link:definitionLink