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Fair Value Measurements - Financial Instruments Excluding Guaranteed Living Benefits (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2011
Dec. 31, 2010
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total fixed maturities, AFS $ 78,132 $ 77,820
Short-term investments 8,861 8,528
Equity securities, AFS 1,081 973
Total Derivative assets 481 799
Separate account assets 153,140 153,727
Total assets accounted for at fair value on a recurring basis 275,200 275,316
Percentage of level to total 100.00% 100.00%
Assets accounted for at fair value on a recurring basis [Abstract]    
Fixed maturities, FVO 1,227 649
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities (515) (780)
Other liabilities (44) (37)
Consumer notes (4) (5)
Total liabilities accounted for at fair value on a recurring basis (573) (831)
Equity Securities [Member]
    
Assets accounted for at fair value on a recurring basis [Abstract]    
Equity securities, trading 32,278 32,820
Equity Securities [Member] | Available-for-sale Securities [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Equity securities, AFS 1,081 973
Equity Securities [Member] | Available-for-sale Securities [Member] | Level 1 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Equity securities, AFS 377 298
Equity Securities [Member] | Available-for-sale Securities [Member] | Level 2 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Equity securities, AFS 604 521
Equity Securities [Member] | Available-for-sale Securities [Member] | Level 3 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Equity securities, AFS 100 154
Equity Securities [Member] | Level 1 [Member]
    
Assets accounted for at fair value on a recurring basis [Abstract]    
Equity securities, trading 2,227 2,279
Equity Securities [Member] | Level 2 [Member]
    
Assets accounted for at fair value on a recurring basis [Abstract]    
Equity securities, trading 30,051 30,541
Equity Securities [Member] | Level 3 [Member]
    
Assets accounted for at fair value on a recurring basis [Abstract]    
Equity securities, trading 0 0
Level 1 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 0 0
Separate account assets 116,044 116,717
Total assets accounted for at fair value on a recurring basis 119,386 120,269
Percentage of level to total 43.00% 44.00%
Assets accounted for at fair value on a recurring basis [Abstract]    
Fixed maturities, FVO 0 0
Level 1 [Member] | Short-term Investments [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Short-term investments 327 541
Level 1 [Member] | Fixed maturities AFS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total fixed maturities, AFS 411 434
Level 1 [Member] | ABS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | CDOs [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | CMBS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | Corporate [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | Foreign govt./govt. agencies [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | Municipal [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | RMBS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 0 0
Level 1 [Member] | U.S. Treasuries [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 411 434
Level 1 [Member] | Credit derivative [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 0 0
Level 1 [Member] | Equity derivative [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 0 0
Level 1 [Member] | Foreign exchange derivative [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 0 0
Level 1 [Member] | Interest rate derivatives [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 0 0
Level 1 [Member] | Other Derivatives Contracts Assets [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 0 0
Level 1 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities 0 0
Other liabilities 0 0
Consumer notes 0 0
Total liabilities accounted for at fair value on a recurring basis 0 0
Level 1 [Member] | Equity linked notes [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total other policyholder funds and benefits payable 0 0
Level 1 [Member] | Credit derivative [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities 0 0
Level 1 [Member] | Equity derivative [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities 0 0
Level 1 [Member] | Foreign exchange derivative [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities 0 0
Level 1 [Member] | Interest rate derivatives [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities 0 0
Level 2 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 386 780
Separate account assets 36,028 35,763
Total assets accounted for at fair value on a recurring basis 146,759 145,616
Percentage of level to total 54.00% 53.00%
Assets accounted for at fair value on a recurring basis [Abstract]    
Fixed maturities, FVO 671 127
Level 2 [Member] | Short-term Investments [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Short-term investments 8,534 7,987
Level 2 [Member] | Fixed maturities AFS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total fixed maturities, AFS 70,485 69,897
Level 2 [Member] | ABS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 2,845 2,412
Level 2 [Member] | CDOs [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 0 30
Level 2 [Member] | CMBS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 6,623 7,228
Level 2 [Member] | Corporate [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 39,519 37,755
Level 2 [Member] | Foreign govt./govt. agencies [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 1,813 1,627
Level 2 [Member] | Municipal [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 12,501 11,852
Level 2 [Member] | RMBS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 4,100 4,398
Level 2 [Member] | U.S. Treasuries [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 3,084 4,595
Level 2 [Member] | Credit derivative [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets (17) (18)
Level 2 [Member] | Equity derivative [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 0 0
Level 2 [Member] | Foreign exchange derivative [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 428 868
Level 2 [Member] | Interest rate derivatives [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets (25) (70)
Level 2 [Member] | Other Derivatives Contracts Assets [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 0 0
Level 2 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities (61) (354)
Other liabilities 0 0
Consumer notes 0 0
Total liabilities accounted for at fair value on a recurring basis (61) (354)
Level 2 [Member] | Equity linked notes [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total other policyholder funds and benefits payable 0 0
Level 2 [Member] | Credit derivative [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities (62) (71)
Level 2 [Member] | Equity derivative [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities 0 0
Level 2 [Member] | Foreign exchange derivative [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities 214 (34)
Level 2 [Member] | Interest rate derivatives [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities (213) (249)
Level 3 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 95 19
Separate account assets 1,068 1,247
Total assets accounted for at fair value on a recurring basis 9,055 9,431
Percentage of level to total 3.00% 3.00%
Assets accounted for at fair value on a recurring basis [Abstract]    
Fixed maturities, FVO 556 522
Level 3 [Member] | Short-term Investments [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Short-term investments 0 0
Level 3 [Member] | Fixed maturities AFS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total fixed maturities, AFS 7,236 7,489
Level 3 [Member] | ABS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 452 477
Level 3 [Member] | CDOs [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 2,575 2,581
Level 3 [Member] | CMBS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 654 689
Level 3 [Member] | Corporate [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 2,110 2,129
Level 3 [Member] | Foreign govt./govt. agencies [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 51 56
Level 3 [Member] | Municipal [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 280 272
Level 3 [Member] | RMBS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 1,114 1,285
Level 3 [Member] | U.S. Treasuries [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 0 0
Level 3 [Member] | Credit derivative [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 14 21
Level 3 [Member] | Equity derivative [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 3 2
Level 3 [Member] | Foreign exchange derivative [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 0 0
Level 3 [Member] | Interest rate derivatives [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 48 (36)
Level 3 [Member] | Other Derivatives Contracts Assets [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 30 32
Level 3 [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities (454) (426)
Other liabilities (44) (37)
Consumer notes (4) (5)
Total liabilities accounted for at fair value on a recurring basis (512) (477)
Level 3 [Member] | Equity linked notes [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total other policyholder funds and benefits payable (10) (9)
Level 3 [Member] | Credit derivative [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities (416) (411)
Level 3 [Member] | Equity derivative [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities 3 2
Level 3 [Member] | Foreign exchange derivative [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities 0 0
Level 3 [Member] | Interest rate derivatives [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities (41) (17)
Short-term Investments [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Short-term investments 8,861 8,528
Equity linked notes [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total other policyholder funds and benefits payable (10) (9)
Fixed maturities AFS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total fixed maturities, AFS 78,132 77,820
ABS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 3,297 2,889
CDOs [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 2,575 2,611
CMBS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 7,277 7,917
Corporate [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 41,629 39,884
Foreign govt./govt. agencies [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 1,864 1,683
Municipal [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 12,781 12,124
RMBS [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 5,214 5,683
U.S. Treasuries [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Fixed maturities 3,495 5,029
Credit derivative [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets (3) 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities (478) (482)
Equity derivative [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 3 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities 3 2
Foreign exchange derivative [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 428 868
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities 214 (34)
Interest rate derivatives [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets 23 (106)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total derivative liabilities (254) (266)
Other Derivatives Contracts Assets [Member]
    
Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items]    
Total Derivative assets $ 30 $ 32