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Fair Value Measurements Level 4 Fair Value by Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities $ 59,196 $ 59,384
Assets, Fair Value Disclosure [Abstract]    
Marketable Securities, Fixed Maturities 503 488
Trading Securities, Equity [1] 11 11
Available-for-sale Securities, Equity Securities 1,121 1,047
Other Short-term Investments 1,843 4,883
Alternative Investments, Fair Value Disclosure 2,874 2,942
Reinsurance Recoverables 23,189 22,920
Separate Account Assets 120,123 134,702
Assets, Fair Value Disclosure 181,633 199,248
Liabilities, Fair Value Disclosure [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure (1,086) (1,095)
Derivative Liability, Fair Value, Amount Offset Against Collateral 23 137
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 740 106
Assets, Fair Value Disclosure [Abstract]    
Marketable Securities, Fixed Maturities 2 0
Trading Securities, Equity [1] 11 11
Available-for-sale Securities, Equity Securities 874 786
Other Short-term Investments 333 349
Assets, Fair Value Disclosure 80,070 92,789
Liabilities, Fair Value Disclosure [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 55,143 55,803
Assets, Fair Value Disclosure [Abstract]    
Marketable Securities, Fixed Maturities 485 396
Trading Securities, Equity [1] 0 0
Available-for-sale Securities, Equity Securities 154 163
Other Short-term Investments 1,510 4,534
Assets, Fair Value Disclosure 97,314 101,735
Liabilities, Fair Value Disclosure [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure (900) (1,004)
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 3,313 3,475
Assets, Fair Value Disclosure [Abstract]    
Marketable Securities, Fixed Maturities 16 92
Trading Securities, Equity [1] 0 0
Available-for-sale Securities, Equity Securities 93 98
Other Short-term Investments 0 0
Assets, Fair Value Disclosure 4,249 4,724
Liabilities, Fair Value Disclosure [Abstract]    
Financial and Nonfinancial Liabilities, Fair Value Disclosure (186) (91)
Asset-backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 2,499 2,472
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 0 0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 2,462 2,350
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 37 122
Collateralized Debt Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 3,038 2,841
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 0 0
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 2,497 2,218
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 541 623
Commercial Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 4,717 4,415
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 0 0
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 4,567 4,131
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 150 284
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 122 284
Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 26,802 27,359
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 0 0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 25,948 26,319
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 854 1,040
Foreign Government Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 1,308 1,636
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 0 0
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 1,248 1,577
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 60 59
US States and Political Subdivisions Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 12,121 12,871
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 0 0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 12,072 12,805
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 49 66
Residential Mortgage Backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 4,046 3,918
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 0 0
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 2,424 2,637
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 1,622 1,281
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 1,622 1,281
US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 4,665 3,872
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 740 106
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 3,925 3,766
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale Securities, Debt Securities 0 0
Other Policyholder Funds and Benefits Payable [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (288)  
Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (288)  
Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (165)
Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (165)
Credit Risk Contract [Member] | Other Investments [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 21 8
Credit Risk Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0 0
Credit Risk Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 21 10
Credit Risk Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0 (2)
Credit Risk Contract [Member] | Other Liabilities [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (16)  
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (16)  
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (16)
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (9)
Credit Risk Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (7)
Equity Contract [Member] | Other Investments [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   3
Equity Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Equity Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Equity Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   3
Equity Contract [Member] | Other Liabilities [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 41  
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 41  
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   28
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   25
Equity Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   3
Foreign Exchange Contract [Member] | Other Investments [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 15  
Foreign Exchange Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Foreign Exchange Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 15  
Foreign Exchange Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Foreign Exchange Contract [Member] | Other Liabilities [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (374)  
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (374)  
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (445)
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (445)
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Interest Rate Contract [Member] | Other Investments [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (227) 129
Interest Rate Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0 0
Interest Rate Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (227) 113
Interest Rate Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0 16
Interest Rate Contract [Member] | Other Liabilities [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (569)  
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (547)  
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (22)  
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (597)
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (574)
Interest Rate Contract [Member] | Other Liabilities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (23)
Other Contract [Member] | Other Investments [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 7 12
Other Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0 0
Other Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0 0
Other Contract [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 7 12
Derivative Financial Instruments, Assets [Member] | Other Investments [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net [2] 1 364
Derivative Financial Instruments, Assets [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net [2] (164) 128
Derivative Financial Instruments, Assets [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net [2] 165 236
Derivative Financial Instruments, Liabilities [Member]    
Liabilities, Fair Value Disclosure [Abstract]    
Derivative Liability, Fair Value, Amount Offset Against Collateral 283 413
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net [3] (798) (927)
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net [3] 0 0
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net [3] (900) (1,004)
Derivative Financial Instruments, Liabilities [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net [3] 102 77
Embedded Derivative Financial Instruments [Member] | Other Liabilities [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net [4]   (3)
Embedded Derivative Financial Instruments [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net [4]   0
Embedded Derivative Financial Instruments [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net [4]   0
Embedded Derivative Financial Instruments [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net [4]   (3)
US GMWB Hedging Instruments [Member] | Other Contract [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 131 124
GMWB Reinsurance [Member]    
Assets, Fair Value Disclosure [Abstract]    
Reinsurance Recoverables 83 56
GMWB Reinsurance [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Reinsurance Recoverables 0 0
GMWB Reinsurance [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Reinsurance Recoverables 0 0
GMWB Reinsurance [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Reinsurance Recoverables   56
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]    
Assets, Fair Value Disclosure [Abstract]    
Reinsurance Recoverables 79 34
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Reinsurance Recoverables 0 0
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Reinsurance Recoverables 79 34
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Reinsurance Recoverables 0 0
Equity Linked Notes [Member] | Other Policyholder Funds and Benefits Payable [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (26)  
Equity Linked Notes [Member] | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Equity Linked Notes [Member] | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Equity Linked Notes [Member] | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (26)
Equity Linked Notes [Member] | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Equity Linked Notes [Member] | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Equity Linked Notes [Member] | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (26)
UNITED STATES | US GMWB Hedging Instruments [Member] | Other Investments [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 111 119
UNITED STATES | US GMWB Hedging Instruments [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0 0
UNITED STATES | US GMWB Hedging Instruments [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 27 5
UNITED STATES | US GMWB Hedging Instruments [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 84 114
UNITED STATES | US GMWB Hedging Instruments [Member] | Other Liabilities [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 47 55
UNITED STATES | US GMWB Hedging Instruments [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0 0
UNITED STATES | US GMWB Hedging Instruments [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net (4) (1)
UNITED STATES | US GMWB Hedging Instruments [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 51 56
UNITED STATES | Macro Hedge Program [Member] | Other Investments [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 74 93
UNITED STATES | Macro Hedge Program [Member] | Other Investments [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0 0
UNITED STATES | Macro Hedge Program [Member] | Other Investments [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0 0
UNITED STATES | Macro Hedge Program [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 74 93
UNITED STATES | Macro Hedge Program [Member] | Other Liabilities [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 73 48
UNITED STATES | Macro Hedge Program [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0 0
UNITED STATES | Macro Hedge Program [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0 0
UNITED STATES | Macro Hedge Program [Member] | Other Liabilities [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 73 48
Portion at Other than Fair Value Measurement [Member]    
Assets, Fair Value Disclosure [Abstract]    
Separate Account Assets 1,800 2,500
Portion at Fair Value Measurement [Member]    
Assets, Fair Value Disclosure [Abstract]    
Alternative Investments, Fair Value Disclosure [5] 622 770
Separate Account Assets [6] 118,174 132,211
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Alternative Investments, Fair Value Disclosure [5] 0 0
Separate Account Assets [6] 78,110 91,537
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Alternative Investments, Fair Value Disclosure [5] 548 581
Separate Account Assets [6] 39,559 40,096
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Alternative Investments, Fair Value Disclosure [5] 74 189
Separate Account Assets [6] 505 578
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 (262)  
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net 0  
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net $ (262)  
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   (139)
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   0
Guaranteed Minimum Withdrawal Benefit [Member] | UNITED STATES | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Assets, Fair Value Disclosure [Abstract]    
Derivative Assets (Liabilities), at Fair Value, Net   $ (139)
[1] [1]Included in other investments on the Consolidated Balance Sheets.
[2] [2]Includes 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. As of December 31, 2015 and 2014, $283 and $413, respectively, of cash collateral liability was netted against the derivative asset value in the Consolidated Balance Sheets and is excluded from the preceding table. See footnote 5 for derivative liabilities.
[3] [5]Includes OTC and OTC-cleared derivative instruments in a net negative fair market 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.
[4] [6]Represents embedded derivatives associated with non-funding agreement-backed consumer equity linked notes
[5] Represents hedge funds where investment company accounting has been applied to a wholly-owned fund of funds measured at fair value.
[6] [3]Represents hedge funds where investment company accounting has been applied to a wholly-owned fund of funds measured at fair value.