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Fair Value (Assets and liabilities measured at fair value on a recurring basis) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Fixed maturity securities | $ 42,799 | $ 42,633
Equity securities | 201 | 249
Other invested assets | 49 | 59
Short term investments | 1,555 | 1,832
Separate account business | 279 | 312
Derivative financial instruments, included in Other liabilities | (1) | (3)
Fair Value, Measurements, Recurring [Member] |  |
Fixed maturity securities | 42,799 | 42,633
Equity securities | 201 | 249
Other invested assets | 49 | 59
Short term investments | 1,504 | 1,792
Life settlement contracts, included in Other assets | 95 | 100
Separate account business | 279 | 312
Total assets | 44,927 | 45,145
Derivative financial instruments, included in Other liabilities | (1) | (3)
Total liabilities | (1) | (3)
Fair Value, Measurements, Recurring [Member] | Corporate and other bonds [Member] |  |
Fixed maturity securities | 22,354 | 22,236
Fair Value, Measurements, Recurring [Member] | States, municipalities and political subdivisions [Member] |  |
Fixed maturity securities | 10,948 | 10,783
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed [Member] |  |
Fixed maturity securities | 5,683 | 5,920
Fair Value, Measurements, Recurring [Member] | Commercial mortgage-backed [Member] |  |
Fixed maturity securities | 1,990 | 1,822
Fair Value, Measurements, Recurring [Member] | Other asset-backed [Member] |  |
Fixed maturity securities | 955 | 952
Fair Value, Measurements, Recurring [Member] | Total asset-backed [Member] |  |
Fixed maturity securities | 8,628 | 8,694
Fair Value, Measurements, Recurring [Member] | U.S. Treasury and obligations of government-sponsored enterprises [Member] |  |
Fixed maturity securities | 181 | 182
Fair Value, Measurements, Recurring [Member] | Foreign government [Member] |  |
Fixed maturity securities | 552 | 613
Fair Value, Measurements, Recurring [Member] | Redeemable preferred stock [Member] |  |
Fixed maturity securities | 136 | 125
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Fixed maturity securities | 342 | 344
Equity securities | 120 | 117
Other invested assets |  |
Short term investments | 1,102 | 987
Life settlement contracts, included in Other assets |  |
Separate account business | 11 | 4
Total assets | 1,575 | 1,452
Derivative financial instruments, included in Other liabilities |  |
Total liabilities |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate and other bonds [Member] |  |
Fixed maturity securities | 32 | 6
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | States, municipalities and political subdivisions [Member] |  |
Fixed maturity securities |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Residential mortgage-backed [Member] |  |
Fixed maturity securities |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commercial mortgage-backed [Member] |  |
Fixed maturity securities |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other asset-backed [Member] |  |
Fixed maturity securities |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Total asset-backed [Member] |  |
Fixed maturity securities |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury and obligations of government-sponsored enterprises [Member] |  |
Fixed maturity securities | 155 | 158
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign government [Member] |  |
Fixed maturity securities | 104 | 140
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Redeemable preferred stock [Member] |  |
Fixed maturity securities | 51 | 40
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Fixed maturity securities | 40,977 | 41,038
Equity securities | 62 | 98
Other invested assets | 49 | 58
Short term investments | 397 | 799
Life settlement contracts, included in Other assets |  |
Separate account business | 266 | 306
Total assets | 41,751 | 42,299
Derivative financial instruments, included in Other liabilities |  | (2)
Total liabilities |  | (2)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate and other bonds [Member] |  |
Fixed maturity securities | 22,020 | 22,011
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | States, municipalities and political subdivisions [Member] |  |
Fixed maturity securities | 10,819 | 10,687
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Residential mortgage-backed [Member] |  |
Fixed maturity securities | 5,233 | 5,507
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial mortgage-backed [Member] |  |
Fixed maturity securities | 1,813 | 1,693
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other asset-backed [Member] |  |
Fixed maturity securities | 559 | 584
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Total asset-backed [Member] |  |
Fixed maturity securities | 7,605 | 7,784
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasury and obligations of government-sponsored enterprises [Member] |  |
Fixed maturity securities | 26 | 24
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign government [Member] |  |
Fixed maturity securities | 448 | 473
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Redeemable preferred stock [Member] |  |
Fixed maturity securities | 59 | 59
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Fixed maturity securities | 1,480 | 1,251
Equity securities | 19 | 34
Other invested assets |  | 1
Short term investments | 5 | 6
Life settlement contracts, included in Other assets | 95 | 100
Separate account business | 2 | 2
Total assets | 1,601 | 1,394
Derivative financial instruments, included in Other liabilities | (1) | (1)
Total liabilities | (1) | (1)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate and other bonds [Member] |  |
Fixed maturity securities | 302 | 219
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | States, municipalities and political subdivisions [Member] |  |
Fixed maturity securities | 129 | 96
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Residential mortgage-backed [Member] |  |
Fixed maturity securities | 450 | 413
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commercial mortgage-backed [Member] |  |
Fixed maturity securities | 177 | 129
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other asset-backed [Member] |  |
Fixed maturity securities | 396 | 368
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Total asset-backed [Member] |  |
Fixed maturity securities | 1,023 | 910
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Treasury and obligations of government-sponsored enterprises [Member] |  |
Fixed maturity securities |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign government [Member] |  |
Fixed maturity securities |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Redeemable preferred stock [Member] |  |
Fixed maturity securities | $ 26 | $ 26

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