| **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 summarized below.September 30, 2013      TotalAssets/(Liabilities)at Fair Value(In millions)Level 1 Level 2 Level 3 Assets       Fixed maturity securities:       Corporate and other bonds$27 $20,945 $211 $21,183States, municipalities and political subdivisions— 11,364 95 11,459Asset-backed:       Residential mortgage-backed— 4,449 370 4,819Commercial mortgage-backed— 1,860 157 2,017Other asset-backed— 523 433 956Total asset-backed— 6,832 960 7,792U.S. Treasury and obligations of government-sponsored enterprises144 29 — 173Foreign government81 480 — 561Redeemable preferred stock48 58 — 106Total fixed maturity securities300 39,708 1,266 41,274Equity securities135 51 13 199Other invested assets— 55 — 55Short term investments992 430 — 1,422Life settlement contracts, included in Other assets— — 90 90Separate account business12 199 2 213Total assets$1,439 $40,443 $1,371 $43,253Liabilities       Derivative financial instruments, included in Other liabilities$— $(1) $— $(1)Total liabilities$— $(1) $— $(1)December 31, 2012      TotalAssets/(Liabilities)at Fair Value(In millions)Level 1 Level 2 Level 3 Assets       Fixed maturity securities:       Corporate and other bonds$6 $22,011 $219 $22,236States, municipalities and political subdivisions— 10,687 96 10,783Asset-backed:       Residential mortgage-backed— 5,507 413 5,920Commercial mortgage-backed— 1,693 129 1,822Other asset-backed— 584 368 952Total asset-backed— 7,784 910 8,694U.S. Treasury and obligations of government-sponsored enterprises158 24 — 182Foreign government140 473 — 613Redeemable preferred stock40 59 26 125Total fixed maturity securities344 41,038 1,251 42,633Equity securities117 98 34 249Other invested assets— 58 1 59Short term investments987 799 6 1,792Life settlement contracts, included in Other assets— — 100 100Separate account business4 306 2 312Total assets$1,452 $42,299 $1,394 $45,145Liabilities       Derivative financial instruments, included in Other liabilities$— $(2) $(1) $(3)Total liabilities$— $(2) $(1) $(3)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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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) for the three months ended September 30, 2013 and 2012.Level 3(In millions)Balance atJuly 1,2013 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 atSeptember 30,2013 Unrealized gains (losses) on Level 3 assets and liabilities held at September 30, 2013 recognized in net income (loss)*Fixed maturity securities:                   Corporate and other bonds$202 $1 $— $6 $(6) $(8) $17 $(1) $211 $—States, municipalities and political subdivisions140 — (3) — — (15) — (27) 95 —Asset-backed:                   Residential mortgage-backed428 — (20) 5 — (21) — (22) 370 (1)Commercial mortgage-backed165 (1) (2) 10 — (1) — (14) 157 —Other asset-backed387 — 1 56 — (6) — (5) 433 (1)Total asset-backed980 (1) (21) 71 — (28) — (41) 960 (2)Redeemable preferred stock25 (1) 1 — — (25) — — — —Total fixed maturity securities1,347 (1) (23) 77 (6) (76) 17 (69) 1,266 (2)Equity securities13 (2) 2 — — — — — 13 (2)Life settlement contracts91 3 — — — (4) — — 90 —Separate account business2 — — — — — — — 2 —Total$1,453 $— $(21) $77 $(6) $(80) $17 $(69) $1,371 $(4)Level 3(In millions)Balance atJuly 1,2012 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 atSeptember 30,2012 Unrealized gains (losses) on Level 3 assets and liabilities held at September 30, 2012 recognized in net income (loss)*Fixed maturity securities:                   Corporate and other bonds$488 $1 $(4) $50 $(5) $(11) $— $(260) $259 $(1)States, municipalities and political subdivisions89 — — — — — — — 89 —Asset-backed:                   Residential mortgage-backed443 (17) 20 21 — (8) — (22) 437 (18)Commercial mortgage-backed166 4 6 12 — (17) 11 (65) 117 —Other asset-backed434 2 5 143 (117) (34) — (62) 371 —Total asset-backed1,043 (11) 31 176 (117) (59) 11 (149) 925 (18)Redeemable preferred stock27 — (1) — — — — — 26 —Total fixed maturity securities1,647 (10) 26 226 (122) (70) 11 (409) 1,299 (19)Equity securities93 (19) (10) — — — — (14) 50 (19)Other invested assets, including derivatives, net10 — — — — — — — 10 —Short term investments4 — — 7 (4) — 1 — 8 —Life settlement contracts116 7 — — — (10) — — 113 —Separate account business3 — — — — — — — 3 —Total$1,873 $(22) $16 $233 $(126) $(80) $12 $(423) $1,483 $(38)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) for the nine months ended September 30, 2013 and 2012.Level 3(In millions)Balance atJanuary 1,2013 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 atSeptember 30,2013 Unrealized gains (losses) on Level 3 assets and liabilities held at September 30, 2013 recognized in net income (loss)*Fixed maturity securities:                   Corporate and other bonds$219 $2 $(1) $129 $(96) $(34) $43 $(51) $211 $(2)States, municipalities and political subdivisions96 (3) 1 122 (79) (20) 5 (27) 95 —Asset-backed:                   Residential mortgage-backed413 2 (21) 116 (10) (53) 4 (81) 370 (3)Commercial mortgage-backed129 — 7 88 — (10) 21 (78) 157 —Other asset-backed368 3 (1) 230 (132) (30) — (5) 433 (2)Total asset-backed910 5 (15) 434 (142) (93) 25 (164) 960 (5)Redeemable preferred stock26 (1) — — — (25) — — — —Total fixed maturity securities1,251 3 (15) 685 (317) (172) 73 (242) 1,266 (7)Equity securities34 (22) 2 — — — — (1) 13 (22)Other invested assets, including derivatives, net— — — — (1) 1 — — — —Short term investments6 — — — (6) — — — — —Life settlement contracts100 14 — — — (24) — — 90 (1)Separate account business2 — — — — — — — 2 —Total$1,393 $(5) $(13) $685 $(324) $(195) $73 $(243) $1,371 $(30)Level 3(In millions)Balance atJanuary 1,2012 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 atSeptember 30,2012 Unrealized gains (losses) on Level 3 assets and liabilities held at September 30, 2012 recognized in net income (loss)*Fixed maturity securities:                   Corporate and other bonds$482 $7 $2 $197 $(118) $(43) $42 $(310) $259 $(1)States, municipalities and political subdivisions171 — 3 — — (85) — — 89 —Asset-backed:                   Residential mortgage-backed452 (15) (2) 81 — (24) — (55) 437 (18)Commercial mortgage-backed59 6 14 141 (12) (21) 11 (81) 117 —Other asset-backed343 8 8 501 (293) (93) — (103) 371 —Total asset-backed854 (1) 20 723 (305) (138) 11 (239) 925 (18)Redeemable preferred stock— — (1) 53 (26) — — — 26 —Total fixed maturity securities1,507 6 24 973 (449) (266) 53 (549) 1,299 (19)Equity securities67 (19) 6 26 (16) — — (14) 50 (21)Other invested assets, including derivatives, net10 — — — — — — — 10 —Short term investments27 — — 23 (4) (39) 1 — 8 —Life settlement contracts117 30 — — — (34) — — 113 3Separate account business23 — — — (20) — — — 3 —Total$1,751 $17 $30 $1,022 $(489) $(339) $54 $(563) $1,483 $(37) |
| Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets                      | The table below presents quantitative information about the significant unobservable inputs utilized by the Company in the fair value measurements of Level 3 assets.  Valuations for assets and liabilities not presented in the table 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.Assets(In millions)Fair Value at September 30, 2013 Valuation Technique(s) Unobservable Input(s) Range (Weighted Average)Fixed maturity securities$179 Discounted cash flow Expected call date 2.1 - 5.3 years (3.8 years)     Credit spread 1.92% - 26.24% (3.80%)Equity securities$13 Market approach Private offering price $289.80 - $4,273.77 per share($1,337.14 per share)Life settlement contracts$90 Discounted cash flow Discount rate risk premium 9%     Mortality assumption 69% - 883% (208.8%)Assets(In millions)Fair Value at December 31, 2012 Valuation Technique(s) Unobservable Input(s) Range (Weighted Average)Fixed maturity securities$121 Discounted cash flow Expected call date 3.3 - 5.3 years (4.3 years)     Credit spread adjustment 0.02% - 0.48% (0.17%) $72 Market approach Private offering price $42.39 - $102.32 ($100.11)Equity securities$34 Market approach Private offering price $4.54 - $3,842.00 per share($571.17 per share)Life settlement contracts$100 Discounted cash flow Discount rate risk premium 9%     Mortality assumption 69% - 883% (208.9%)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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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 instrument assets and liabilities which are not measured at fair value on the Condensed Consolidated Balance Sheets are listed in the tables below.September 30, 2013CarryingAmount Estimated Fair Value(In millions) Level 1 Level 2 Level 3 TotalFinancial assets         Notes receivable for the issuance of common stock$22 $— $— $22 $22Mortgage loans440 — — 452 452Financial liabilities         Premium deposits and annuity contracts$68 $— $— $69 $69Long term debt2,559 — 2,928 — 2,928December 31, 2012CarryingAmount Estimated Fair Value(In millions) Level 1 Level 2 Level 3 TotalFinancial assets         Notes receivable for the issuance of common stock$21 $— $— $21 $21Mortgage loans401 — — 418 418Financial liabilities         Premium deposits and annuity contracts$100 $— $— $104 $104Short term debt13 — 13 — 13Long term debt2,557 — 3,016 — 3,016                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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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 (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.
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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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