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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value $ 33,158 $ 49,404
Fixed maturities, FVO 935 1,010
Equity securities, trading 1,773 1,847
Available-for-sale Securities, Equity Securities 383 400
Derivative Assets 655 581
Short-term investments 1,398 2,354
Limited Partnerships and Other Alternative Investments 1,376 1,372
Fair Value, Measurements, Recurring [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 33,158 49,404
Fixed maturities, FVO 935 1,010
Equity securities, trading 1,773 1,847
Available-for-sale Securities, Equity Securities 383 400
Short-term investments 1,398 2,354
Limited Partnerships and Other Alternative Investments 445 414
Reinsurance recoverable for U.S. GMWB and Japan GMWB, GMIB, and GMAB 597 1,081
Separate account assets 140,545 138,497
Total assets accounted for at fair value on a recurring basis 179,889 195,588
Percentage of level to total 100.00% 100.00%
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (2,551) (3,091)
Fair Value, Measurements, Recurring [Member] | Other policyholder funds and benefits payable [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (2,214) (3,127)
Fair Value, Measurements, Recurring [Member] | Consumer Notes [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (2) (2)
Fair Value, Measurements, Recurring [Member] | Guaranteed Minimum Withdrawal Benefit [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (2,204) (3,119)
Fair Value, Measurements, Recurring [Member] | Equity linked notes [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (10) (8)
Fair Value, Measurements, Recurring [Member] | Macro Hedge Program [Member] | U.S. [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 208 186
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 35  
Fair Value, Measurements, Recurring [Member] | Hedging Derivatives [Member] | International [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 209 127
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (74) (231)
Fair Value, Measurements, Recurring [Member] | Hedging Derivatives [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | U.S. [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 242 36
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 104 536
Fair Value, Measurements, Recurring [Member] | Derivative Liabilities [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 655 581
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (335) 38
Fair Value, Measurements, Recurring [Member] | Credit derivative [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 26 (10)
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (1) (6)
Fair Value, Measurements, Recurring [Member] | Equity derivative [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 11 30
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 16 15
Fair Value, Measurements, Recurring [Member] | Foreign exchange derivative [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets (112) 104
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (40) (17)
Fair Value, Measurements, Recurring [Member] | Interest rate derivatives [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 71 108
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (375) (359)
Fair Value, Measurements, Recurring [Member] | ABS [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 1,315 1,673
Fair Value, Measurements, Recurring [Member] | Collateralized Debt Obligations [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 1,664 2,160
Fair Value, Measurements, Recurring [Member] | CMBS [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 2,878 3,912
Fair Value, Measurements, Recurring [Member] | Corporate [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 19,284 30,979
Fair Value, Measurements, Recurring [Member] | Foreign Government Debt Securities [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 1,281 1,460
Fair Value, Measurements, Recurring [Member] | Municipal [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 1,114 1,998
Fair Value, Measurements, Recurring [Member] | RMBS [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 3,313 4,671
Fair Value, Measurements, Recurring [Member] | U.S. Treasuries [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 2,309 2,551
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 77 78
Fixed maturities, FVO 0 6
Equity securities, trading 1,773 1,847
Available-for-sale Securities, Equity Securities 205 203
Short-term investments 242 242
Limited Partnerships and Other Alternative Investments 0 0
Reinsurance recoverable for U.S. GMWB and Japan GMWB, GMIB, and GMAB 0 0
Separate account assets 101,713 97,976
Total assets accounted for at fair value on a recurring basis 104,010 100,352
Percentage of level to total 58.00% 52.00%
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other policyholder funds and benefits payable [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Consumer Notes [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Guaranteed Minimum Withdrawal Benefit [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity linked notes [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Macro Hedge Program [Member] | U.S. [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Hedging Derivatives [Member] | International [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Hedging Derivatives [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | U.S. [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Derivative Liabilities [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Credit derivative [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity derivative [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign exchange derivative [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest rate derivatives [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | ABS [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Collateralized Debt Obligations [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | CMBS [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign Government Debt Securities [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | RMBS [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasuries [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 77 78
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 29,572 45,157
Fixed maturities, FVO 734 805
Equity securities, trading 0 0
Available-for-sale Securities, Equity Securities 123 142
Short-term investments 1,156 2,112
Limited Partnerships and Other Alternative Investments 283 264
Reinsurance recoverable for U.S. GMWB and Japan GMWB, GMIB, and GMAB 5 0
Separate account assets 38,009 39,938
Total assets accounted for at fair value on a recurring basis 70,122 88,755
Percentage of level to total 39.00% 45.00%
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (327) (440)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other policyholder funds and benefits payable [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Consumer Notes [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Guaranteed Minimum Withdrawal Benefit [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity linked notes [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Macro Hedge Program [Member] | U.S. [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Hedging Derivatives [Member] | International [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 249 142
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 31 (171)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Hedging Derivatives [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | U.S. [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 17 (53)
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 106
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Derivative Liabilities [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 240 337
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (327) (440)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Credit derivative [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 15 0
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 4 (20)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity derivative [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign exchange derivative [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets (112) 104
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (40) (17)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest rate derivatives [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 71 144
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (322) (338)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | ABS [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 1,090 1,435
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Collateralized Debt Obligations [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 1,099 1,437
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | CMBS [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 2,388 3,380
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 18,188 29,639
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign Government Debt Securities [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 1,246 1,426
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 982 1,829
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | RMBS [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 2,347 3,538
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasuries [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 2,232 2,473
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 3,509 4,169
Fixed maturities, FVO 201 199
Equity securities, trading 0 0
Available-for-sale Securities, Equity Securities 55 55
Short-term investments 0 0
Limited Partnerships and Other Alternative Investments 162 150
Reinsurance recoverable for U.S. GMWB and Japan GMWB, GMIB, and GMAB 592 1,081
Separate account assets 823 583
Total assets accounted for at fair value on a recurring basis 5,757 6,481
Percentage of level to total 3.00% 3.00%
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (2,224) (2,651)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other policyholder funds and benefits payable [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (2,214) (3,127)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Consumer Notes [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (2) (2)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Guaranteed Minimum Withdrawal Benefit [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (2,204) (3,119)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity linked notes [Member]
    
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (10) (8)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Macro Hedge Program [Member] | U.S. [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 208 186
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 35  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Hedging Derivatives [Member] | International [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets (40) (15)
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (105) (60)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Hedging Derivatives [Member] | Guaranteed Minimum Withdrawal Benefit [Member] | U.S. [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 225 89
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 104 430
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Derivative Liabilities [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 415 244
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (8) 478
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Credit derivative [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 11 (10)
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (5) 14
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity derivative [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 11 30
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 16 15
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign exchange derivative [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest rate derivatives [Member]
    
Assets accounted for at fair value on a recurring basis    
Derivative Assets 0 (36)
Liabilities accounted for at fair value on a recurring basis    
Total liabilities accounted for at fair value on a recurring basis (53) (21)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | ABS [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 225 238
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Collateralized Debt Obligations [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 565 723
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | CMBS [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 490 532
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 1,096 1,340
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign Government Debt Securities [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 35 34
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Municipal [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 132 169
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | RMBS [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value 966 1,133
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Treasuries [Member]
    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS, fair value $ 0 $ 0