| **Fair Value (Tables)**                                                                                                             | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   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| **Fair Value Disclosures [Abstract]**                                                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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| Assets and liabilities measured at fair value on a recurring basis                                                                  | Assets and liabilities measured at fair value on a recurring basis are presented in the following tables.September 30, 2016      TotalAssets/Liabilitiesat Fair Value(In millions)Level 1 Level 2 Level 3 Assets       Fixed maturity securities:       Corporate and other bonds$— $19,557 $261 $19,818States, municipalities and political subdivisions— 13,500 1 13,501Asset-backed:       Residential mortgage-backed— 5,286 79 5,365Commercial mortgage-backed— 2,120 24 2,144Other asset-backed— 916 43 959Total asset-backed— 8,322 146 8,468U.S. Treasury and obligations of government-sponsored enterprises76 — — 76Foreign government— 438 — 438Redeemable preferred stock20 — — 20Total fixed maturity securities96 41,817 408 42,321Equity securities97 — 19 116Other invested assets— 5 — 5Short term investments432 911 — 1,343Life settlement contracts, included in Other assets— — 67 67Total assets$625 $42,733 $494 $43,852Liabilities       Other liabilities$— $8 $— $8Total liabilities$— $8 $— $8December 31, 2015      TotalAssets/Liabilitiesat Fair Value(In millions)Level 1 Level 2 Level 3 Assets       Fixed maturity securities:       Corporate and other bonds$— $17,592 $168 $17,760States, municipalities and political subdivisions— 13,172 2 13,174Asset-backed:       Residential mortgage-backed— 4,938 134 5,072Commercial mortgage-backed— 2,175 22 2,197Other asset-backed— 868 53 921Total asset-backed— 7,981 209 8,190U.S. Treasury and obligations of government-sponsored enterprises66 1 — 67Foreign government— 346 — 346Redeemable preferred stock35 — — 35Total fixed maturity securities101 39,092 379 39,572Equity securities177 — 20 197Other invested assets— 17 — 17Short term investments448 1,134 — 1,582Life settlement contracts, included in Other assets— — 74 74Total assets$726 $40,243 $473 $41,442Liabilities       Other liabilities$— $(5) $— $(5)Total liabilities$— $(5) $— $(5)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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| Table of reconciliation for assets and liablities measured at fair value on a recurring basis using significant unobservable inputs | The tables below present a reconciliation for all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3).Level 3(In millions)Balance as ofJuly 1,2016 Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in Net income (loss)* Net change in unrealized appreciation (depreciation) included in Other comprehensive income (loss) Purchases Sales Settlements Transfers intoLevel 3 Transfers out of Level 3 Balance as ofSeptember 30,2016 Unrealized gains (losses) on Level 3 assets and liabilities held as of September 30, 2016 recognized in Net income (loss)*Fixed maturity securities:                   Corporate and other bonds$242 $1 $7 $16 $— $(5) $— $— $261 $—States, municipalities and political subdivisions2 — — — — (1) — — 1 —Asset-backed:                   Residential mortgage-backed134 — (1) 5 — (1) — (58) 79 —Commercial mortgage-backed11 — — 23 — (8) — (2) 24 —Other asset-backed45 — — 34 — — — (36) 43 —Total asset-backed190 — (1) 62 — (9) — (96) 146 —Total fixed maturity securities434 1 6 78 — (15) — (96) 408 —Equity securities19 (1) 1 — — — — — 19 (2)Life settlement contracts67 — — — — — — — 67 —Total$520 $— $7 $78 $— $(15) $— $(96) $494 $(2)Level 3(In millions)Balance as ofJuly 1,2015 Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in Net income (loss)* Net change in unrealized appreciation (depreciation) included in Other comprehensive income (loss) Purchases Sales Settlements Transfers intoLevel 3 Transfers out of Level 3 Balance as ofSeptember 30,2015 Unrealized gains (losses) on Level 3 assets and liabilities held as of September 30, 2015 recognized in Net income (loss)*Fixed maturity securities:                   Corporate and other bonds$141 $— $— $27 $(1) $(11) $— $(3) $153 $—States, municipalities and political subdivisions85 — — — — — — (24) 61 —Asset-backed:                   Residential mortgage-backed207 2 (2) 4 — (7) — — 204 —Commercial mortgage-backed87 5 (4) 8 — (15) — (10) 71 —Other asset-backed490 — (6) 43 (20) (32) — (4) 471 —Total asset-backed784 7 (12) 55 (20) (54) — (14) 746 —Total fixed maturity securities1,010 7 (12) 82 (21) (65) — (41) 960 —Equity securities16 — (1) — — — — — 15 —Life settlement contracts75 5 — — — (6) — — 74 2Total$1,101 $12 $(13) $82 $(21) $(71) $— $(41) $1,049 $2Level 3(In millions)Balance as ofJanuary 1, 2016 Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in Net income (loss)* Net change in unrealized appreciation (depreciation) included in Other comprehensive income (loss) Purchases Sales Settlements Transfers intoLevel 3 Transfers out of Level 3 Balance as ofSeptember 30,2016 Unrealized gains (losses) on Level 3 assets and liabilities held as of September 30, 2016 recognized in Net income (loss)*Fixed maturity securities:                   Corporate and other bonds$168 $1 $14 $163 $(36) $(15) $— $(34) $261 $—States, municipalities and political subdivisions2 — — — — (1) — — 1 —Asset-backed:                   Residential mortgage-backed134 2 (2) 15 — (10) — (60) 79 —Commercial mortgage-backed22 — — 32 — (17) 3 (16) 24 —Other asset-backed53 — 2 69 (25) (1) 2 (57) 43 —Total asset-backed209 2 — 116 (25) (28) 5 (133) 146 —Total fixed maturity securities379 3 14 279 (61) (44) 5 (167) 408 —Equity securities20 (1) — — — — — — 19 (2)Life settlement contracts74 10 — — — (17) — — 67 2Total$473 $12 $14 $279 $(61) $(61) $5 $(167) $494 $—Level 3(In millions)Balance as ofJanuary 1, 2015 Net realized investment gains (losses) and net change in unrealized appreciation (depreciation) included in Net income (loss)* Net change in unrealized appreciation (depreciation) included in Other comprehensive income (loss) Purchases Sales Settlements Transfers intoLevel 3 Transfers out of Level 3 Balance as ofSeptember 30,2015 Unrealized gains (losses) on Level 3 assets and liabilities held as of September 30, 2015 recognized in Net income (loss)*Fixed maturity securities:                   Corporate and other bonds$162 $(1) $(1) $39 $(13) $(32) $37 $(38) $153 $—States, municipalities and political subdivisions94 1 — — — (10) — (24) 61 —Asset-backed:                   Residential mortgage-backed189 4 (4) 76 — (28) — (33) 204 —Commercial mortgage-backed83 7 (4) 23 — (17) 17 (38) 71 —Other asset-backed655 3 4 125 (254) (52) — (10) 471 (1)Total asset-backed927 14 (4) 224 (254) (97) 17 (81) 746 (1)Total fixed maturity securities1,183 14 (5) 263 (267) (139) 54 (143) 960 (1)Equity securities16 — (1) — — — — — 15 —Life settlement contracts82 22 — — — (30) — — 74 1Total$1,281 $36 $(6) $263 $(267) $(169) $54 $(143) $1,049 $— |
| Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets                      | The following tables present quantitative information about the significant unobservable inputs utilized by the Company in the fair value measurement of Level 3 assets.  Valuations for assets and liabilities not presented in the tables below are primarily based on broker/dealer quotes for which there is a lack of transparency as to inputs used to develop the valuations.  The quantitative detail of these unobservable inputs is neither provided nor reasonably available to the Company.September 30, 2016Estimated Fair Value (In millions) Valuation Technique(s) Unobservable Input(s) Range (Weighted Average)Fixed maturity securities$211 Discounted cash flow Credit spread  2% - 40% (6%)Life settlement contracts67 Discounted cash flow Discount rate risk premium 9%     Mortality assumption 55% - 1676% (162%)December 31, 2015Estimated Fair Value (In millions) Valuation Technique(s) Unobservable Input(s) Range (Weighted Average)Fixed maturity securities$138 Discounted cash flow Credit spread  3% - 184% (6%)Life settlement contracts74 Discounted cash flow Discount rate risk premium 9%     Mortality assumption 55% - 1676% (164%)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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| Carrying amount and estimated fair value of financial instrument assets and liabilities not measured at fair value                  | The carrying amount and estimated fair value of the Company's financial assets and liabilities which are not measured at fair value on the Condensed Consolidated Balance Sheets are presented in the following tables.September 30, 2016CarryingAmount Estimated Fair Value(In millions) Level 1 Level 2 Level 3 TotalAssets         Mortgage loans$629 $— $— $654 $654Liabilities         Long term debt$2,709 $— $3,041 $— $3,041December 31, 2015CarryingAmount Estimated Fair Value(In millions) Level 1 Level 2 Level 3 TotalAssets         Mortgage loans$678 $— $— $688 $688Liabilities         Short term debt$350 $— $360 $— $360Long term debt2,210 — 2,433 — 2,433                                                                                                                                                                                                                   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| - Definition
Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.
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| - Definition
Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.
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| - Definition
Tabular disclosure of quantitative information about the inputs used in the fair value measurement of assets. This disclosure may include, but is not limited to, the fair value of the asset, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs.
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| - Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
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