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Fair Value Measurements Level 4 Fair Value by Hierarchy (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction Period 1 year    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0   $ 0
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 60,693,000,000 $ 59,196,000,000  
Trading Securities, Equity 11,000,000 11,000,000 [1]  
Available-for-sale Securities, Equity Securities 798,000,000 1,121,000,000  
Short-term investments 1,918,000,000 1,843,000,000  
Alternative Investments, Fair Value Disclosure 2,654,000,000 2,874,000,000  
Reinsurance recoverable for U.S. GMWB 23,125,000,000 23,189,000,000  
Separate Account Assets 118,361,000,000 120,123,000,000  
Assets, Fair Value Disclosure 180,515,000,000 181,633,000,000  
Marketable Securities, Fixed Maturities 486,000,000 503,000,000  
Liabilities, Fair Value Disclosure [Abstract]      
Total liabilities accounted for at fair value on a recurring basis (1,273,000,000) (1,086,000,000)  
Derivative Liability, Fair Value, Amount Offset Against Collateral 64,000,000 23,000,000  
Separate Accounts [Member]      
Liabilities, Fair Value Disclosure [Abstract]      
Fair Value Investments Entities that Calculate NAV 1,200,000,000 1,200,000,000  
Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (386,000,000)    
Credit derivative [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 16,000,000 21,000,000  
Credit derivative [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (39,000,000)    
Equity Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 2,000,000 15,000,000  
Equity Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 28,000,000    
Foreign Exchange Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 5,000,000    
Foreign Exchange Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (338,000,000)    
Interest Rate Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (138,000,000) (227,000,000)  
Interest Rate Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (665,000,000)    
Other Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 5,000,000 7,000,000  
Derivative Financial Instruments, Assets [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net [1] 100,000,000 1,000,000 [2]  
Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net [3] (887,000,000) (798,000,000) [4]  
ABS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 2,665,000,000 2,499,000,000  
Collateralized Debt Obligations [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities [5] 3,107,000,000 3,038,000,000  
CMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 5,224,000,000 4,717,000,000  
Corporate [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 27,297,000,000 26,802,000,000  
Foreign Government Debt Securities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 1,189,000,000 1,308,000,000  
Municipal [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 12,303,000,000 12,121,000,000  
RMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 4,338,000,000 4,046,000,000  
U.S. Treasuries [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 741,000,000 106,000,000  
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 4,570,000,000 4,665,000,000  
Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 67,000,000 740,000,000  
Trading Securities, Equity 11,000,000 11,000,000 [1]  
Available-for-sale Securities, Equity Securities 548,000,000 874,000,000  
Short-term investments 447,000,000 333,000,000  
Assets, Fair Value Disclosure 75,559,000,000 80,070,000,000  
Marketable Securities, Fixed Maturities 0 2,000,000  
Liabilities, Fair Value Disclosure [Abstract]      
Total liabilities accounted for at fair value on a recurring basis 0 0  
Level 1 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Level 1 [Member] | Credit derivative [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Level 1 [Member] | Credit derivative [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Level 1 [Member] | Equity Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Level 1 [Member] | Equity Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Level 1 [Member] | Foreign Exchange Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Level 1 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Level 1 [Member] | Interest Rate Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Level 1 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Level 1 [Member] | Other Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Level 1 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 [3] 0 [4]  
Level 1 [Member] | ABS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 0 0  
Level 1 [Member] | Collateralized Debt Obligations [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 0 0  
Level 1 [Member] | CMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 0 0  
Level 1 [Member] | Corporate [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 0 0  
Level 1 [Member] | Foreign Government Debt Securities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 0 0  
Level 1 [Member] | Municipal [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 0 0  
Level 1 [Member] | RMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 0 0  
Level 1 [Member] | U.S. Treasuries [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 67,000,000 740,000,000  
Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 57,072,000,000 $ 55,143,000,000  
Trading Securities, Equity 0 [1]  
Available-for-sale Securities, Equity Securities 158,000,000 $ 154,000,000  
Short-term investments 1,471,000,000 1,510,000,000  
Assets, Fair Value Disclosure 99,330,000,000 95,907,000,000  
Marketable Securities, Fixed Maturities 472,000,000 485,000,000  
Liabilities, Fair Value Disclosure [Abstract]      
Total liabilities accounted for at fair value on a recurring basis (1,002,000,000) (900,000,000)  
Level 2 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Level 2 [Member] | Credit derivative [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 16,000,000 21,000,000  
Level 2 [Member] | Credit derivative [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (39,000,000)    
Level 2 [Member] | Equity Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 15,000,000  
Level 2 [Member] | Equity Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 25,000,000    
Level 2 [Member] | Foreign Exchange Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 5,000,000    
Level 2 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (338,000,000)    
Level 2 [Member] | Interest Rate Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (138,000,000) (227,000,000)  
Level 2 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (637,000,000)    
Level 2 [Member] | Other Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Level 2 [Member] | Derivative Financial Instruments, Assets [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (56,000,000) [1] (164,000,000) [2]  
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (1,002,000,000) [3] (900,000,000) [4]  
Level 2 [Member] | ABS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 2,633,000,000 2,462,000,000  
Level 2 [Member] | Collateralized Debt Obligations [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 2,565,000,000 2,497,000,000  
Level 2 [Member] | CMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 5,090,000,000 4,567,000,000  
Level 2 [Member] | Corporate [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 26,463,000,000 25,948,000,000  
Level 2 [Member] | Foreign Government Debt Securities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 1,113,000,000 1,248,000,000  
Level 2 [Member] | Municipal [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 12,253,000,000 12,072,000,000  
Level 2 [Member] | RMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 2,452,000,000 2,424,000,000  
Level 2 [Member] | U.S. Treasuries [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 4,503,000,000 3,925,000,000  
Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 3,554,000,000 $ 3,313,000,000  
Trading Securities, Equity 0 [1]  
Available-for-sale Securities, Equity Securities 92,000,000 $ 93,000,000  
Short-term investments 0 0  
Assets, Fair Value Disclosure 4,070,000,000 3,810,000,000  
Marketable Securities, Fixed Maturities 14,000,000 16,000,000  
Liabilities, Fair Value Disclosure [Abstract]      
Total liabilities accounted for at fair value on a recurring basis (271,000,000) (186,000,000)  
Level 3 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (386,000,000)    
Level 3 [Member] | Credit derivative [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Level 3 [Member] | Credit derivative [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Level 3 [Member] | Equity Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 2,000,000 0  
Level 3 [Member] | Equity Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 3,000,000    
Level 3 [Member] | Foreign Exchange Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Level 3 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Level 3 [Member] | Interest Rate Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Level 3 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (28,000,000)    
Level 3 [Member] | Other Contract [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 5,000,000 7,000,000  
Level 3 [Member] | Derivative Financial Instruments, Assets [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 156,000,000 [1] 165,000,000 [2]  
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 115,000,000 [3] 102,000,000 [4]  
Level 3 [Member] | ABS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 32,000,000 37,000,000  
Level 3 [Member] | Collateralized Debt Obligations [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 542,000,000 541,000,000  
Level 3 [Member] | CMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 134,000,000 150,000,000  
Level 3 [Member] | Corporate [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 834,000,000 854,000,000  
Level 3 [Member] | Foreign Government Debt Securities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 76,000,000 60,000,000  
Level 3 [Member] | Municipal [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 50,000,000 49,000,000  
Level 3 [Member] | RMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 1,886,000,000 1,622,000,000  
Level 3 [Member] | U.S. Treasuries [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 0 0  
Fair Value, Measurements, Recurring [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (288,000,000)  
Fair Value, Measurements, Recurring [Member] | Credit derivative [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (16,000,000)  
Fair Value, Measurements, Recurring [Member] | Equity Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   41,000,000  
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (374,000,000)  
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (569,000,000)  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Credit derivative [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Credit derivative [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (16,000,000)  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   41,000,000  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (374,000,000)  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (547,000,000)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (288,000,000)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Credit derivative [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (22,000,000)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | CMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 115,000,000 122,000,000  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | RMBS [Member]      
Assets, Fair Value Disclosure [Abstract]      
Total fixed maturities 1,886,000,000 1,622,000,000  
US GMWB Hedging Instruments [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   47,000,000  
US GMWB Hedging Instruments [Member] | Level 1 [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
US GMWB Hedging Instruments [Member] | Level 2 [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (4,000,000)  
US GMWB Hedging Instruments [Member] | Level 3 [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   51,000,000  
US GMWB Hedging Instruments [Member] | Level 3 [Member] | Other Contract [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 150,000,000 131,000,000  
US GMWB Hedging Instruments [Member] | UNITED STATES | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 146,000,000 111,000,000  
US GMWB Hedging Instruments [Member] | UNITED STATES | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 46,000,000    
US GMWB Hedging Instruments [Member] | UNITED STATES | Level 1 [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
US GMWB Hedging Instruments [Member] | UNITED STATES | Level 1 [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
US GMWB Hedging Instruments [Member] | UNITED STATES | Level 2 [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 61,000,000 27,000,000  
US GMWB Hedging Instruments [Member] | UNITED STATES | Level 2 [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (13,000,000)    
US GMWB Hedging Instruments [Member] | UNITED STATES | Level 3 [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 85,000,000 84,000,000  
US GMWB Hedging Instruments [Member] | UNITED STATES | Level 3 [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 59,000,000    
Equity Linked Notes [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (25,000,000)    
Equity Linked Notes [Member] | Level 1 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Equity Linked Notes [Member] | Level 2 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Equity Linked Notes [Member] | Level 3 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (25,000,000)    
Equity Linked Notes [Member] | Fair Value, Measurements, Recurring [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (26,000,000)  
Equity Linked Notes [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Equity Linked Notes [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Equity Linked Notes [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (26,000,000)  
GMWB Reinsurance [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance recoverable for U.S. GMWB 99,000,000 83,000,000  
GMWB Reinsurance [Member] | Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance recoverable for U.S. GMWB 0 0  
GMWB Reinsurance [Member] | Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance recoverable for U.S. GMWB 0 0  
GMWB Reinsurance [Member] | Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance recoverable for U.S. GMWB 99,000,000 83,000,000  
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance recoverable for U.S. GMWB 57,000,000 79,000,000  
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance recoverable for U.S. GMWB 0 0  
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance recoverable for U.S. GMWB 57,000,000 79,000,000  
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Reinsurance recoverable for U.S. GMWB 0 0  
Macro Hedge Program [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   73,000,000  
Macro Hedge Program [Member] | Level 1 [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Macro Hedge Program [Member] | Level 2 [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Macro Hedge Program [Member] | Level 3 [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   73,000,000  
Macro Hedge Program [Member] | UNITED STATES | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 64,000,000 74,000,000  
Macro Hedge Program [Member] | UNITED STATES | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 81,000,000    
Macro Hedge Program [Member] | UNITED STATES | Level 1 [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Macro Hedge Program [Member] | UNITED STATES | Level 1 [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Macro Hedge Program [Member] | UNITED STATES | Level 2 [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0 0  
Macro Hedge Program [Member] | UNITED STATES | Level 2 [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Macro Hedge Program [Member] | UNITED STATES | Level 3 [Member] | Other Investments [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 64,000,000 74,000,000  
Macro Hedge Program [Member] | UNITED STATES | Level 3 [Member] | Other liabilities [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 81,000,000    
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (361,000,000)    
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Level 1 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Level 2 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net 0    
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Level 3 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net (361,000,000)    
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Fair Value, Measurements, Recurring [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (262,000,000)  
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   0  
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other policyholder funds and benefits payable [Member]      
Assets, Fair Value Disclosure [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net   (262,000,000)  
Portion at Fair Value Measurement [Member]      
Assets, Fair Value Disclosure [Abstract]      
Alternative Investments, Fair Value Disclosure 394,000,000 [2] 622,000,000 [6]  
Separate Account Assets 115,959,000,000 [6] 118,174,000,000 [3]  
Portion at Fair Value Measurement [Member] | Level 1 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Alternative Investments, Fair Value Disclosure 0 [2] 0 [6]  
Separate Account Assets 74,486,000,000 [6] 78,110,000,000 [3]  
Portion at Fair Value Measurement [Member] | Level 2 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Alternative Investments, Fair Value Disclosure 0 [2] 0 [6]  
Separate Account Assets 40,156,000,000 [6] 38,700,000,000 [3]  
Portion at Fair Value Measurement [Member] | Level 3 [Member]      
Assets, Fair Value Disclosure [Abstract]      
Alternative Investments, Fair Value Disclosure 0 [2] 0 [6]  
Separate Account Assets 155,000,000 [6] 140,000,000 [3]  
Portion at Other than Fair Value Measurement [Member]      
Assets, Fair Value Disclosure [Abstract]      
Separate Account Assets [6] $ 2,400,000,000 $ 1,800,000,000  
Hedge Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Percentage 8.00% 9.00%  
Hedge Funds [Member] | Separate Accounts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Percentage 29.00% 28.00%  
Private Equity Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Percentage 4.00% 3.00%  
Private Equity Funds [Member] | Separate Accounts [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Percentage 5.00% 4.00%  
[1] [1]Included in other investments on the Condensed Consolidated Balance Sheets.
[2] [2]Includes over-the-counter ("OTC") and OTC-cleared derivative instruments in a net positive fair value position after consideration of the accrued interest and impact of collateral posting requirements which may be imposed by agreements, clearing house rules and applicable law. See the following footnote 5 for derivative liabilities.
[3] [4]Approximately $2.4 billion and $1.8 billion of investment sales receivable, as of March 31, 2016, and December 31, 2015, respectively, are excluded from this disclosure requirement because they are trade receivables in the ordinary course of business where the carrying amount approximates fair value.
[4] [5]Includes OTC and OTC-cleared derivative instruments in a net negative fair value position (derivative liability) after consideration of the accrued interest and impact of collateral posting requirements, which may be imposed by agreements, clearing house rules and applicable law. In the following Level 3 roll-forward table in this Note 4, the derivative assets and liabilities are referred to as “freestanding derivatives” and are presented on a net basis.
[5] Gross unrealized gains (losses) exclude the fair value of bifurcated embedded derivatives within certain securities. Subsequent changes in value are recorded in net realized capital gains (losses).
[6] [3]Represents hedge funds where investment company accounting has been applied to a wholly-owned fund of funds measured at fair value.