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Fair Value Measurements Level 4 Fair Value by Hierarchy (Details) - USD ($)
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Fair Value Measurement [Domain]            
Assets, Fair Value Disclosure [Abstract]            
Alternative Investments, Fair Value Disclosure $ 5,000,000 [1]   $ 622,000,000 [2]      
Separate Account Assets 114,607,000,000 [2]   118,174,000,000 [3]      
Fair Value Measurement [Domain] | Level 1 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Alternative Investments, Fair Value Disclosure 0 [1]   0 [2]      
Separate Account Assets 73,805,000,000   78,110,000,000 [3]      
Fair Value Measurement [Domain] | Level 2 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Alternative Investments, Fair Value Disclosure 0 [1]   0 [2]      
Separate Account Assets 39,605,000,000   38,700,000,000 [3]      
Fair Value Measurement [Domain] | Level 3 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Alternative Investments, Fair Value Disclosure 0 [1]   0 [2]      
Separate Account Assets 171,000,000   140,000,000 [3]      
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0     $ 0    
Available-for-sale Securities, Debt Securities 61,241,000,000   59,196,000,000      
Trading Securities, Equity 11,000,000   11,000,000 [4]      
Available-for-sale Securities, Equity Securities 827,000,000   1,121,000,000      
Short-term investments 2,497,000,000   1,843,000,000      
Alternative Investments, Fair Value Disclosure 2,578,000,000   2,874,000,000      
Reinsurance recoverable for U.S. GMWB 23,152,000,000   23,189,000,000      
Separate Account Assets 117,851,000,000   120,123,000,000      
Assets, Fair Value Disclosure 180,046,000,000   181,633,000,000      
Marketable Securities, Fixed Maturities 411,000,000   503,000,000      
Liabilities, Fair Value Disclosure [Abstract]            
Total liabilities accounted for at fair value on a recurring basis (1,432,000,000)   (1,086,000,000)      
Derivative Liability, Fair Value, Amount Offset Against Collateral 36,000,000   23,000,000      
Separate Accounts [Member]            
Liabilities, Fair Value Disclosure [Abstract]            
Fair Value Investments Entities that Calculate NAV 1,000,000,000   1,200,000,000      
Other policyholder funds and benefits payable [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net (440,000,000)          
Credit derivative [Member] | Other Investments [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net 29,000,000   21,000,000      
Credit derivative [Member] | Other liabilities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net (36,000,000)          
Equity Contract [Member] | Other Investments [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net     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 27,000,000          
Foreign Exchange Contract [Member] | Other liabilities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net (281,000,000)          
Interest Rate Contract [Member] | Other Investments [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net 115,000,000   (227,000,000)      
Interest Rate Contract [Member] | Other liabilities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net (919,000,000)          
Other Contract [Member] | Other Investments [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net 4,000,000   7,000,000      
Derivative Financial Instruments, Assets [Member] | Other Investments [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net [4] 309,000,000   1,000,000 [1]      
Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net [3] (992,000,000)   (798,000,000)      
ABS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 2,777,000,000   2,499,000,000      
Collateralized Debt Obligations [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities [5] 2,867,000,000   3,038,000,000      
CMBS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 5,195,000,000   4,717,000,000      
Corporate [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 27,158,000,000   26,802,000,000      
Foreign Government Debt Securities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 1,188,000,000   1,308,000,000      
Municipal [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 12,611,000,000   12,121,000,000      
RMBS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 4,826,000,000   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 67,000,000   808,000,000 0   $ 0
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 4,619,000,000   4,665,000,000      
Level 1 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 509,000,000   740,000,000      
Trading Securities, Equity 11,000,000   11,000,000 [4]      
Available-for-sale Securities, Equity Securities 564,000,000   874,000,000      
Short-term investments 457,000,000   333,000,000      
Assets, Fair Value Disclosure 75,346,000,000   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      
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      
Level 1 [Member] | ABS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 0   0      
Level 1 [Member] | Collateralized Debt Obligations [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 0   0      
Level 1 [Member] | CMBS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 0   0      
Level 1 [Member] | Corporate [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 0   0      
Level 1 [Member] | Foreign Government Debt Securities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 0   0      
Level 1 [Member] | Municipal [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 0   0      
Level 1 [Member] | RMBS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 0   0      
Level 1 [Member] | U.S. Treasuries [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 509,000,000   740,000,000      
Level 2 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 56,963,000,000   55,143,000,000      
Trading Securities, Equity 0   [4]      
Available-for-sale Securities, Equity Securities 166,000,000   154,000,000      
Short-term investments 2,040,000,000   1,510,000,000      
Assets, Fair Value Disclosure 99,380,000,000   95,907,000,000      
Marketable Securities, Fixed Maturities 405,000,000   485,000,000      
Liabilities, Fair Value Disclosure [Abstract]            
Total liabilities accounted for at fair value on a recurring basis (1,131,000,000)   (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 29,000,000   21,000,000      
Level 2 [Member] | Credit derivative [Member] | Other liabilities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net (36,000,000)          
Level 2 [Member] | Equity Contract [Member] | Other Investments [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net     15,000,000      
Level 2 [Member] | Equity Contract [Member] | Other liabilities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net 27,000,000          
Level 2 [Member] | Foreign Exchange Contract [Member] | Other Investments [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net 27,000,000          
Level 2 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net (281,000,000)          
Level 2 [Member] | Interest Rate Contract [Member] | Other Investments [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net 115,000,000   (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 (887,000,000)          
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 169,000,000 [4]   (164,000,000) [1]      
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net (1,131,000,000) [3]   (900,000,000)      
Level 2 [Member] | ABS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 2,736,000,000   2,462,000,000      
Level 2 [Member] | Collateralized Debt Obligations [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 2,389,000,000   2,497,000,000      
Level 2 [Member] | CMBS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 5,116,000,000   4,567,000,000      
Level 2 [Member] | Corporate [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 26,022,000,000   25,948,000,000      
Level 2 [Member] | Foreign Government Debt Securities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 1,116,000,000   1,248,000,000      
Level 2 [Member] | Municipal [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 12,521,000,000   12,072,000,000      
Level 2 [Member] | RMBS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 2,953,000,000   2,424,000,000      
Level 2 [Member] | U.S. Treasuries [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 4,110,000,000   3,925,000,000      
Level 3 [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 3,769,000,000   3,313,000,000      
Trading Securities, Equity 0   [4]      
Available-for-sale Securities, Equity Securities 97,000,000   93,000,000      
Short-term investments 0   0      
Assets, Fair Value Disclosure 4,289,000,000   3,810,000,000      
Marketable Securities, Fixed Maturities 6,000,000   16,000,000      
Liabilities, Fair Value Disclosure [Abstract]            
Total liabilities accounted for at fair value on a recurring basis (301,000,000)   (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 (440,000,000)          
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     0      
Level 3 [Member] | Equity Contract [Member] | Other liabilities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net 1,000,000          
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 (32,000,000)          
Level 3 [Member] | Other Contract [Member] | Other Investments [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net 4,000,000   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 140,000,000 [4]   165,000,000 [1]      
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net 139,000,000 [3]   102,000,000      
Level 3 [Member] | ABS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 41,000,000   37,000,000      
Level 3 [Member] | Collateralized Debt Obligations [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 478,000,000   541,000,000      
Level 3 [Member] | CMBS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 79,000,000   150,000,000      
Level 3 [Member] | Corporate [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 1,136,000,000   854,000,000      
Level 3 [Member] | Foreign Government Debt Securities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 72,000,000   60,000,000      
Level 3 [Member] | Municipal [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 90,000,000   49,000,000      
Level 3 [Member] | RMBS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 1,873,000,000   1,622,000,000      
Level 3 [Member] | U.S. Treasuries [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 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, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (440,000,000) $ (386,000,000) (288,000,000) (138,000,000) $ (202,000,000) (165,000,000)
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] | Embedded Derivative Financial Instruments [Member] | Other liabilities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value       (3,000,000) (3,000,000) (3,000,000)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | CMBS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 58,000,000   122,000,000      
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | RMBS [Member]            
Assets, Fair Value Disclosure [Abstract]            
Available-for-sale Securities, Debt Securities 1,873,000,000   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 166,000,000   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 85,000,000   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 118,000,000          
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 (2,000,000)   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 40,000,000          
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 87,000,000   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 78,000,000          
Equity Linked Notes [Member] | Other policyholder funds and benefits payable [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net (28,000,000)          
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]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (28,000,000)          
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)      
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (28,000,000) (25,000,000) (26,000,000) (26,000,000) (26,000,000) (26,000,000)
GMWB Reinsurance [Member]            
Assets, Fair Value Disclosure [Abstract]            
Reinsurance recoverable for U.S. GMWB 106,000,000   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     83,000,000      
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]            
Assets, Fair Value Disclosure [Abstract]            
Reinsurance recoverable for U.S. GMWB 32,000,000   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 32,000,000   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 49,000,000   74,000,000      
Macro Hedge Program [Member] | UNITED STATES | Other liabilities [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net 98,000,000          
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 6,000,000          
Macro Hedge Program [Member] | UNITED STATES | Level 3 [Member] | Other Investments [Member]            
Assets, Fair Value Disclosure [Abstract]            
Derivative Assets (Liabilities), at Fair Value, Net 49,000,000   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 92,000,000          
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 (412,000,000)          
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]            
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (412,000,000) $ (361,000,000) (262,000,000) $ (112,000,000) $ (176,000,000) $ (139,000,000)
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 Other than Fair Value Measurement [Member]            
Assets, Fair Value Disclosure [Abstract]            
Separate Account Assets [2] $ 3,200,000,000   $ 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     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 35.00%   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     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 9.00%   4.00%      
[1] [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.
[2] [3]Represents hedge funds where investment company accounting has been applied to a wholly-owned fund of funds measured at fair value. The fair value is estimated using the net asset value per unit as a practical expedient and is excluded from the disclosure requirement to classify amounts in the fair value hierarchy in connection with the retrospective adoption of ASU 2015-07, Disclosure for Investments in Certain Entities That Calculate Net Asset Value per Share (or its Equivalent), on January 1, 2016.
[3] [4]Approximately $3.2 billion and $1.8 billion of investment sales receivable, as of June 30, 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. Included in the total fair value amount are $1.0 billion and $1.2 billion of investments, as of June 30, 2016 and December 31, 2015, for which the fair value is estimated using the net asset value per unit as a practical expedient and which are excluded from the disclosure requirement to classify amounts in the fair value hierarchy in connection with the retrospective adoption of ASU 2015-07, Disclosure for Investments in Certain Entities That Calculate Net Asset Value per Share (or its Equivalent), on January 1, 2016.
[4] [1]Included in other investments on the Condensed Consolidated Balance Sheets.
[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).