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Fair Value Measurements Level 4 Fair Value by Hierarchy (Details) - Fair Value, Option, Eligible Item or Group [Domain] - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0   $ 0    
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 59,128 $ 59,384      
Fixed maturities, FVO 553 488      
Trading Securities, Equity 11 11 [1]      
Available-for-sale Securities, Equity Securities 856 1,047      
Short-term investments 3,278 4,883      
Alternative Investments, Fair Value Disclosure 3,033 2,942      
Reinsurance recoverable for U.S. GMWB 22,891 22,920      
Separate account assets 131,489 134,702      
Assets, Fair Value Disclosure 192,758 199,248      
Liabilities, Fair Value Disclosure [Abstract]          
Total liabilities accounted for at fair value on a recurring basis (1,020) (1,095)      
Derivative Liability, Fair Value, Amount Offset Against Collateral 210 137      
Other policyholder funds and benefits payable [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net (138)        
Credit derivative [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 33 8      
Credit derivative [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net (26)        
Commodity Contract [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 2        
Commodity Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 1        
Equity Contract [Member] | Other Investments [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 28        
Foreign Exchange Contract [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 9        
Foreign Exchange Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net (479)        
Interest Rate Contract [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 68 129      
Interest Rate Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net (515)        
Other Contract [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 9 12      
Derivative Financial Instruments, Assets [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net [1] 308 364 [2]      
Derivative Financial Instruments, Liabilities [Member]          
Liabilities, Fair Value Disclosure [Abstract]          
Derivative Liability, Fair Value, Amount Offset Against Collateral 289 413      
Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net [3] (879) (927) [4]      
Embedded Derivative Financial Instruments [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net (3) [4] (3) [5]      
ABS [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 2,890 2,472      
Collateralized Debt Obligations [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities [6] 3,218 2,841      
CMBS [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 4,664 4,415      
Corporate [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 26,610 27,359      
Foreign Government Debt Securities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 1,313 1,636      
Municipal [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 12,298 12,871      
RMBS [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 3,969 3,918      
U.S. Treasuries [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 4,166 3,872      
Level 1 [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 471 106      
Fixed maturities, FVO 0 0      
Trading Securities, Equity 11 11 [1]      
Available-for-sale Securities, Equity Securities 588 786      
Short-term investments 588 349      
Assets, Fair Value Disclosure 88,954 92,789      
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] | Commodity Contract [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 0        
Level 1 [Member] | Commodity Contract [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 [4]      
Level 1 [Member] | Embedded Derivative Financial Instruments [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 0 [4] 0 [5]      
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 471 106      
Level 2 [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 55,266 55,803      
Fixed maturities, FVO 467 396      
Trading Securities, Equity 0 0 [1]      
Available-for-sale Securities, Equity Securities 171 163      
Short-term investments 2,690 4,534      
Assets, Fair Value Disclosure 99,009 101,735      
Liabilities, Fair Value Disclosure [Abstract]          
Total liabilities accounted for at fair value on a recurring basis (964) (1,004)      
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 33 10      
Level 2 [Member] | Credit derivative [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net (26)        
Level 2 [Member] | Commodity Contract [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 0        
Level 2 [Member] | Commodity Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 0        
Level 2 [Member] | Equity Contract [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net   0      
Level 2 [Member] | Equity Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 25        
Level 2 [Member] | Foreign Exchange Contract [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 9        
Level 2 [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net (479)        
Level 2 [Member] | Interest Rate Contract [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 54 113      
Level 2 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net (487)        
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 102 [1] 128 [2]      
Level 2 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net (964) [3] (1,004) [4]      
Level 2 [Member] | Embedded Derivative Financial Instruments [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 0 [4] 0 [5]      
Level 2 [Member] | ABS [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 2,837 2,350      
Level 2 [Member] | Collateralized Debt Obligations [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 2,654 2,218      
Level 2 [Member] | CMBS [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 4,450 4,131      
Level 2 [Member] | Corporate [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 25,679 26,319      
Level 2 [Member] | Foreign Government Debt Securities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 1,273 1,577      
Level 2 [Member] | Municipal [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 12,249 12,805      
Level 2 [Member] | RMBS [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 2,429 2,637      
Level 2 [Member] | U.S. Treasuries [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 3,695 3,766      
Level 3 [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 3,391 3,475      
Fixed maturities, FVO 86 92      
Trading Securities, Equity 0 0 [1]      
Available-for-sale Securities, Equity Securities 97 98      
Short-term investments 0 0      
Assets, Fair Value Disclosure 4,795 4,724      
Liabilities, Fair Value Disclosure [Abstract]          
Total liabilities accounted for at fair value on a recurring basis (56) (91)      
Level 3 [Member] | Other policyholder funds and benefits payable [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net (138)        
Level 3 [Member] | Credit derivative [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 0 (2)      
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] | Commodity Contract [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 2        
Level 3 [Member] | Commodity Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 1        
Level 3 [Member] | Equity Contract [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net   3      
Level 3 [Member] | Equity Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 3        
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 14 16      
Level 3 [Member] | Interest Rate Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net (28)        
Level 3 [Member] | Other Contract [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 9 12      
Level 3 [Member] | Derivative Financial Instruments, Assets [Member] | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 206 [1] 236 [2]      
Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 85 [3] 77 [4]      
Level 3 [Member] | Embedded Derivative Financial Instruments [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net (3) [4] (3) [5]      
Level 3 [Member] | ABS [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 53 122      
Level 3 [Member] | Collateralized Debt Obligations [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 564 623      
Level 3 [Member] | CMBS [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 214 284      
Level 3 [Member] | Corporate [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 931 1,040      
Level 3 [Member] | Foreign Government Debt Securities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 40 59      
Level 3 [Member] | Municipal [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 49 66      
Level 3 [Member] | RMBS [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 1,540 1,281      
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   (165)      
Fair Value, Measurements, Recurring [Member] | Credit derivative [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net   (16)      
Fair Value, Measurements, Recurring [Member] | Equity Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net   28      
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net   (445)      
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net   (597)      
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   (9)      
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   25      
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   (445)      
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   (574)      
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]          
Assets, Fair Value Disclosure [Abstract]          
Alternative Investments, Fair Value Disclosure 230 189      
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   (165)      
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   (7)      
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   3      
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   (23)      
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | CMBS [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 214 284      
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | RMBS [Member]          
Assets, Fair Value Disclosure [Abstract]          
Total fixed maturities 1,540 1,281      
Interim Period [Member] | 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 417   309    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0     $ 0  
Annual Period [Member] | 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 524   $ 1,600    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0       $ 0
US GMWB Hedging Instruments [Member] | Level 3 [Member] | Other Contract [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 125 124      
US GMWB Hedging Instruments [Member] | UNITED STATES | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 87 119      
US GMWB Hedging Instruments [Member] | UNITED STATES | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 47 55      
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 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 6 5      
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 3 (1)      
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 81 114      
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 44 56      
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] | 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 (26)        
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)      
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)      
GMWB Reinsurance [Member]          
Assets, Fair Value Disclosure [Abstract]          
Reinsurance recoverable for U.S. GMWB 50 56      
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 50 56      
Coinsurance and Modified Coinsurance Reinsurance Contracts [Member]          
Assets, Fair Value Disclosure [Abstract]          
Reinsurance recoverable for U.S. GMWB 60 34      
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 60 34      
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] | UNITED STATES | Other Investments [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 100 93      
Macro Hedge Program [Member] | UNITED STATES | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 65 48      
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 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 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 100 93      
Macro Hedge Program [Member] | UNITED STATES | Level 3 [Member] | Other liabilities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Derivative Assets (Liabilities), at Fair Value, Net 65 48      
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 (112)        
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 (112)        
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   (139)      
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   (139)      
Portion at Fair Value Measurement [Member]          
Assets, Fair Value Disclosure [Abstract]          
Alternative Investments, Fair Value Disclosure 835 [2] 770 [7]      
Separate account assets 127,679 [7] 132,211 [3]      
Portion at Fair Value Measurement [Member] | Level 1 [Member]          
Assets, Fair Value Disclosure [Abstract]          
Alternative Investments, Fair Value Disclosure 0 [2] 0 [7]      
Separate account assets 87,296 [7] 91,537 [3]      
Portion at Fair Value Measurement [Member] | Level 2 [Member]          
Assets, Fair Value Disclosure [Abstract]          
Alternative Investments, Fair Value Disclosure 605 [2] 581 [7]      
Separate account assets 39,648 [7] 40,096 [3]      
Portion at Fair Value Measurement [Member] | Level 3 [Member]          
Assets, Fair Value Disclosure [Abstract]          
Alternative Investments, Fair Value Disclosure 230 [2] 189 [7]      
Separate account assets 735 [7] 578 [3]      
Portion at Other than Fair Value Measurement [Member]          
Assets, Fair Value Disclosure [Abstract]          
Separate account assets [7] $ 3,800 $ 2,500      
[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. As of June 30, 2015 and December 31, 2014, $289 and $413, respectively, of cash collateral liability was netted against the derivative asset value in the Condensed Consolidated Balance Sheets and is excluded from the preceding table. See the following footnote 4 for derivative liabilities.
[3] [4]Approximately $3.8 billion and $2.5 billion of investment sales receivable, as of June 30, 2015 and December 31, 2014, 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 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.
[5] [6]Represents embedded derivatives associated with non-funding agreement-backed consumer equity linked notes.
[6] Gross unrealized gains (losses) exclude the fair value of bifurcated, embedded derivative features of certain securities. Subsequent changes in value are recorded in net realized capital gains (losses).
[7] [3]Represents hedge funds where investment company accounting has been applied to a wholly-owned fund of funds measured at fair value.