| **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, 2012      TotalAssets/(Liabilities)at Fair Value(In millions)Level 1 Level 2 Level 3 Assets       Fixed maturity securities:       Corporate and other bonds$— $21,569 $259 $21,828States, municipalities and political subdivisions— 10,723 89 10,812Asset-backed:       Residential mortgage-backed— 5,653 437 6,090Commercial mortgage-backed— 1,571 117 1,688Other asset-backed— 595 371 966Total asset-backed— 7,819 925 8,744U.S. Treasury and obligations of government-sponsored enterprises168 24 — 192Foreign government139 475 — 614Redeemable preferred stock29 60 26 115Total fixed maturity securities336 40,670 1,299 42,305Equity securities98 112 50 260Derivative and other financial instruments, included in Other invested assets— — 11 11Short term investments1,209 1,223 8 2,440Life settlement contracts, included in Other assets— — 113 113Separate account business4 338 3 345Total assets$1,647 $42,343 $1,484 $45,474Liabilities    Derivative financial instruments, included in Other liabilities$— $(2) $(1) $(3)Total liabilities$— $(2) $(1) $(3)December 31, 2011      TotalAssets/(Liabilities)at Fair Value(In millions)Level 1 Level 2 Level 3 Assets       Fixed maturity securities:       Corporate and other bonds$— $20,402 $482 $20,884States, municipalities and political subdivisions— 9,611 171 9,782Asset-backed:       Residential mortgage-backed— 5,323 452 5,775Commercial mortgage-backed— 1,295 59 1,354Other asset-backed— 612 343 955Total asset-backed— 7,230 854 8,084U.S. Treasury and obligations of government-sponsored enterprises451 42 — 493Foreign government92 544 — 636Redeemable preferred stock5 53 — 58Total fixed maturity securities548 37,882 1,507 39,937Equity securities124 113 67 304Derivative and other financial instruments, included in Other invested assets— 1 11 12Short term investments1,106 508 27 1,641Life settlement contracts, included in Other assets— — 117 117Separate account business21 373 23 417Total assets$1,799 $38,877 $1,752 $42,428Liabilities       Derivative financial instruments, included in Other liabilities$— $— $(1) $(1)Total liabilities$— $— $(1) $(1)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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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, 2012 and 2011.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)Derivative and other financial instruments, 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)Level 3(In millions)Balance atJuly 1,2011 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 30,2011 Unrealized gains (losses) on Level 3 assets and liabilities held at September 30, 2011 recognized in net income (loss)*Fixed maturity securities:                   Corporate and other bonds$812 $(7) $(3) $113 $(107) $(47) $12 $(154) $619 $(10)States, municipalities and political subdivisions179 — — 3 — — — — 182 —Asset-backed:                  Residential mortgage-backed687 1 (5) 73 (81) (13) — (31) 631 —Commercial mortgage-backed95 — (7) 76 — — — (5) 159 —Other asset-backed491 (5) (6) 114 (105) (25) 2 (37) 429 (4)Total asset-backed1,273 (4) (18) 263 (186) (38) 2 (73) 1,219 (4)Total fixed maturity securities2,264 (11) (21) 379 (293) (85) 14 (227) 2,020 (14)Equity securities36 — — — (1) — — (3) 32 —Derivative and other financial instruments, net9 (1) — 1 — — — — 9 —Short term investments6 — — — — — — — 6 —Life settlement contracts129 11 — — — (15) — — 125 (1)Separate account business37 — — — (2) — — — 35 —Total$2,481 $(1) $(21) $380 $(296) $(100) $14 $(230) $2,227 $(15)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, 2012 and 2011.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)Derivative and other financial instruments, 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)Level 3(In millions)Balance atJanuary 1,2011 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 30,2011 Unrealized gains (losses) on Level 3 assets and liabilities held at September 30, 2011 recognized in net income (loss)*Fixed maturity securities:                   Corporate and other bonds$624 $(5) $(6) $459 $(157) $(144) $52 $(204) $619 $(11)States, municipalities and political subdivisions266 — — 3 — (87) — — 182 —Asset-backed:                   Residential mortgage-backed767 (11) 9 170 (164) (54) — (86) 631 (15)Commercial mortgage-backed73 3 11 81 (4) — — (5) 159 —Other asset-backed359 — (6) 441 (236) (80) 2 (51) 429 (4)Total asset-backed1,199 (8) 14 692 (404) (134) 2 (142) 1,219 (19)Redeemable preferred stock3 3 (3) — (3) — — — — —Total fixed maturity securities2,092 (10) 5 1,154 (564) (365) 54 (346) 2,020 (30)Equity securities26 (2) (1) 19 (12) — 5 (3) 32 (3)Derivative and other financial instruments, net25 2 — 1 (19) — — — 9 1Short term investments27 — — 12 — (23) — (10) 6 —Life settlement contracts129 20 — — — (24) — — 125 2Separate account business41 — — — (6) — — — 35 —Total$2,340 $10 $4 $1,186 $(601) $(412) $59 $(359) $2,227 $(30) |
| Quantitative information about significant unobservable inputs in the fair value measurement of level 3 assets                      |  Fair Value at September 30, 2012 Valuation Technique(s) Unobservable Input(s) Range (Weighted Average)Assets       (In millions)       Fixed maturity securities$98 Discounted cash flow Expected call date 3.6 - 5.6 years (4.6 years) $61 Market approach Private offering price $60.00 - $105.00 ($101.49)Equity securities$33 Market approach Private offering price $0.10 - $3,842.00 per share($583.95 per share) $17 Income approach EBITDA projection (1) $80 million     EBITDA multiple (1) 1.82Life settlement contracts$113 Discounted cash flow Discount rate risk premium 9%     Mortality assumption 65% - 928% (185%)(1) Earnings before interest, tax, depreciation and amortization                                                                                                                                                                                           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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, 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 loans358 — — 374 374Financial liabilities         Premium deposits and annuity contracts$103 $— $— $108 $108Short term debt13 — 13 — 13Long term debt2,557 — 2,986 — 2,986December 31, 2011CarryingAmount EstimatedFair Value(In millions) Financial assets   Notes receivable for the issuance of common stock$22 $22Mortgage loans234 247Financial liabilities   Premium deposits and annuity contracts$109 $114Short term debt83 84Long term debt2,525 2,679   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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 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, 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, issuances, 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 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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