| **Fair Value (Tables)**                                                                                                             | 3 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.March 31, 2013      TotalAssets/(Liabilities)at Fair Value(In millions)Level 1 Level 2 Level 3 Assets       Fixed maturity securities:       Corporate and other bonds$32 $22,020 $302 $22,354States, municipalities and political subdivisions— 10,819 129 10,948Asset-backed:       Residential mortgage-backed— 5,233 450 5,683Commercial mortgage-backed— 1,813 177 1,990Other asset-backed— 559 396 955Total asset-backed— 7,605 1,023 8,628U.S. Treasury and obligations of government-sponsored enterprises155 26 — 181Foreign government104 448 — 552Redeemable preferred stock51 59 26 136Total fixed maturity securities342 40,977 1,480 42,799Equity securities120 62 19 201Other invested assets— 49 — 49Short term investments1,102 397 5 1,504Life settlement contracts, included in Other assets— — 95 95Separate account business11 266 2 279Total assets$1,575 $41,751 $1,601 $44,927Liabilities       Derivative financial instruments, included in Other liabilities$— $— $(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)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| 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 March 31, 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 atMarch 31,2013 Unrealized gains (losses) on Level 3 assets and liabilities held at March 31, 2013 recognized in net income (loss)*Fixed maturity securities:                   Corporate and other bonds$219 $— $2 $110 $(17) $(20) $26 $(18) $302 $(1)States, municipalities and political subdivisions96 (3) — 85 (47) (2) — — 129 —Asset-backed:                   Residential mortgage-backed413 3 — 61 — (11) — (16) 450 —Commercial mortgage-backed129 1 5 73 — (7) — (24) 177 —Other asset-backed368 3 1 136 (99) (13) — — 396 —Total asset-backed910 7 6 270 (99) (31) — (40) 1,023 —Redeemable preferred stock26 — — — — — — — 26 —Total fixed maturity securities1,251 4 8 465 (163) (53) 26 (58) 1,480 (1)Equity securities34 (15) 1 — — — — (1) 19 (15)Other invested assets, including derivatives, net— — — — (1) — — — (1) —Short term investments6 — — — (1) — — — 5 —Life settlement contracts100 7 — — — (12) — — 95 —Separate account business2 — — — — — — — 2 —Total$1,393 $(4) $9 $465 $(165) $(65) $26 $(59) $1,600 $(16)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 atMarch 31,2012 Unrealized gains (losses) on Level 3 assets and liabilities held at March 31, 2012 recognized in net income (loss)*Fixed maturity securities:                   Corporate and other bonds$482 $3 $4 $79 $(86) $(19) $33 $(10) $486 $—States, municipalities and political subdivisions171 — 2 — — — — — 173 —Asset-backed:                   Residential mortgage-backed452 1 (4) 38 — (7) — (33) 447 —Commercial mortgage-backed59 — 4 42 — — — — 105 —Other asset-backed343 4 4 176 (77) (25) — (41) 384 —Total asset-backed854 5 4 256 (77) (32) — (74) 936 —Redeemable preferred stock— — — 53 — — — — 53 —Total fixed maturity securities1,507 8 10 388 (163) (51) 33 (84) 1,648 —Equity securities67 — (3) 11 (1) — — — 74 (2)Other invested assets, including derivatives, net10 — — — — — — — 10 —Short term investments27 — — 12 — (39) — — — —Life settlement contracts117 3 — — — (5) — — 115 (1)Separate account business23 — — — (19) — — — 4 —Total$1,751 $11 $7 $411 $(183) $(95) $33 $(84) $1,851 $(3) |
| Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets                      | Assets(In millions)Fair Value at March 31, 2013 Valuation Technique(s) Unobservable Input(s) Range (Weighted Average)Fixed maturity securities$78 Discounted cash flow Expected call date 3.0 - 4.6 years (4.0 years)     Credit spread adjustment 0.02% - 0.48% (0.17%) $97 Market approach Private offering price $34.70 - $122.09 ($102.97)Equity securities$19 Market approach Private offering price $33.73 - $3,970.99 per share($1,114.32 per share)Life settlement contracts$95 Discounted cash flow Discount rate risk premium 9%     Mortality assumption 69% - 883% (209.2%)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%)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| 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.March 31, 2013CarryingAmount Estimated Fair Value(In millions) Level 1 Level 2 Level 3 TotalFinancial assets         Notes receivable for the issuance of common stock$20 $— $— $20 $20Mortgage loans425 — — 449 449Financial liabilities         Premium deposits and annuity contracts$96 $— $— $100 $100Short term debt13 — 13 — 13Long term debt2,558 — 3,016 — 3,016December 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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