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Fair Value Measurements Level 4 Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Adjustments to Broker Prices Received     0.00%          
Alternative Investments, Fair Value Disclosure $ 3,033   $ 3,033   $ 2,942      
Available-for-sale Securities, Debt Securities 59,128   59,128   59,384      
Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 735 $ 813 735 $ 813 578 $ 602   $ 737
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [1],[2] 7   7 6        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[3],[4] 7   7 4        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [5]     (1)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 224   262 265        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 5   10 1        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 44   50 163        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6] 5   6 4        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [6] 53   57 33        
Available-for-sale Securities, Debt Securities 3,391   3,391   3,475      
Fixed Maturities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 86 139 86 139 92 85 $ 206  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) (3) 10 (5)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (2) 5 7          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 7 5 19          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements   75            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 3 2 7          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 1   11          
Limited Partnerships and Other Alternative Investments [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 230 67 230 67 $ 189 190   $ 108
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [1],[2] 7   0 (5)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[3],[4] 7   8 (5)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 33   33 30        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 0   $ 0 24        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [6]       42        
CMBS [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Valuation Techniques     Discounted cash flows   Discounted cash flows      
Fair Value Measurements, Significant Assumptions     Spread (encompasses prepayment, default risk and loss severity)   Spread (encompasses prepayment, default risk and loss severity)      
Positive or negative relationship of change in input to change in fair value measurement     Decrease   Decrease      
CMBS [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Inputs, Counterparty Credit Risk     698.00%   2475.00%      
CMBS [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Inputs, Counterparty Credit Risk     41.00%   46.00%      
CMBS [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Inputs, Counterparty Credit Risk     205.00%   284.00%      
Corporate [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Valuation Techniques     Discounted cash flows   Discounted cash flows      
Fair Value Measurements, Significant Assumptions     Spread   Spread      
Positive or negative relationship of change in input to change in fair value measurement     Decrease   Decrease      
Corporate [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Inputs, Counterparty Credit Risk     883.00%   765.00%      
Corporate [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Inputs, Counterparty Credit Risk     138.00%   123.00%      
Corporate [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Inputs, Counterparty Credit Risk     373.00%   279.00%      
Municipal [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Valuation Techniques     Discounted cash flows   Discounted cash flows      
Fair Value Measurements, Significant Assumptions     Spread   Spread      
Positive or negative relationship of change in input to change in fair value measurement     Decrease   Decrease      
Municipal [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Inputs, Treasury Yield     192.00%   212.00%      
Municipal [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Inputs, Treasury Yield     192.00%   212.00%      
Municipal [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Inputs, Treasury Yield     192.00%   212.00%      
RMBS [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Valuation Techniques     Discounted cash flows   Discounted cash flows      
RMBS [Member] | Maximum [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Inputs, Counterparty Credit Risk     1758.00%   1904.00%      
Fair Value Inputs, Prepayment Rate     100.00%   7.00%      
Fair Value Inputs, Probability of Default     14.00%   14.00%      
Fair Value Inputs, Loss Severity     100.00%   100.00%      
RMBS [Member] | Minimum [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Inputs, Counterparty Credit Risk     36.00%   23.00%      
Fair Value Inputs, Prepayment Rate     0.00%   0.00%      
Fair Value Inputs, Probability of Default     0.00%   1.00%      
Fair Value Inputs, Loss Severity     0.00%   0.00%      
RMBS [Member] | Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Inputs, Counterparty Credit Risk     155.00%   142.00%      
Fair Value Inputs, Prepayment Rate     5.00%   2.00%      
Fair Value Inputs, Probability of Default     6.00%   7.00%      
Fair Value Inputs, Loss Severity     77.00%   78.00%      
Spread [Member] | RMBS [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Significant Assumptions     Spread   Spread      
Positive or negative relationship of change in input to change in fair value measurement     Decrease   Decrease      
Withdrawal Utilization [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Positive or negative relationship of change in input to change in fair value measurement [7],[8]     Increase          
Withdrawal Utilization [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Unobservable Input Range [8]     100.00%          
Withdrawal Utilization [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Unobservable Input Range [8]     20.00%          
Withdrawal Rates [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Positive or negative relationship of change in input to change in fair value measurement [7],[9]     Increase          
Withdrawal Rates [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Unobservable Input Range [9]     8.00%          
Withdrawal Rates [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Unobservable Input Range [9]     0.00%          
Lapse Rates [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Positive or negative relationship of change in input to change in fair value measurement [7],[10]     Decrease          
Lapse Rates [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Unobservable Input Range [10]     75.00%          
Lapse Rates [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Unobservable Input Range [10]     0.00%          
Reset Elections [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Positive or negative relationship of change in input to change in fair value measurement [7],[11]     Increase          
Reset Elections [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Unobservable Input Range [11]     75.00%          
Reset Elections [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Unobservable Input Range [11]     20.00%          
Equity Volatility [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Positive or negative relationship of change in input to change in fair value measurement [7],[12]     Increase          
Equity Volatility [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Unobservable Input Range [12]     40.00%          
Equity Volatility [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Unobservable Input Range [12]     10.00%          
Prepayment Rate [Member] | RMBS [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Significant Assumptions     Constant prepayment rate   Constant prepayment rate      
Positive or negative relationship of change in input to change in fair value measurement     Decrease [4]   Decrease [4]      
Probability of Default [Member] | RMBS [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Significant Assumptions     Constant default rate   Constant default rate      
Positive or negative relationship of change in input to change in fair value measurement     Decrease   Decrease      
Loss Severity [Member] | RMBS [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Significant Assumptions     Loss severity   Loss severity      
Positive or negative relationship of change in input to change in fair value measurement     Decrease   Decrease      
Asset-backed Securities [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 2,890   $ 2,890   $ 2,472      
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 53   53   122      
Foreign Government Debt Securities [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,313   1,313   1,636      
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 40   40   59      
RMBS [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 3,969   3,969   3,918      
RMBS [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,540   1,540   1,281      
Municipal [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 12,298   12,298   12,871      
Municipal [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 49   49   66      
Corporate [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 26,610   26,610   27,359      
Corporate [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 931   931   1,040      
CMBS [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 4,664   4,664   4,415      
CMBS [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 214   214   284      
Collateralized Debt Obligations [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities [13] 3,218   3,218   2,841      
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 564   564   623      
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Alternative Investments, Fair Value Disclosure 230   $ 230   189      
Fair Value, Measurements, Recurring [Member] | Limited Partnerships and Other Alternative Investments [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Valuation Processes, Description     The predominant valuation method uses a NAV calculated on a monthly basis and represents funds where the Company does not have the ability to redeem the investment in the near-term at that NAV, including an assessment of the investee's liquidity.          
Fair Value, Measurements, Recurring [Member] | RMBS [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 1,540   $ 1,540   1,281      
Fair Value, Measurements, Recurring [Member] | Municipal [Member] | Non-Broker Priced [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 31   31   32      
Fair Value, Measurements, Recurring [Member] | Corporate [Member] | Non-Broker Priced [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 479   479   568      
Fair Value, Measurements, Recurring [Member] | CMBS [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 214   $ 214   $ 284      
Other Contract [Member] | US GMWB Hedging Instruments [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Valuation Techniques     Discounted cash flows   Discounted cash flows      
Fair Value Measurements, Significant Assumptions     Equity volatility   Equity volatility      
Positive or negative relationship of change in input to change in fair value measurement     Increase   Increase      
Derivative Assets (Liabilities), at Fair Value, Net 125   $ 125   $ 124      
Other Contract [Member] | Maximum [Member] | US GMWB Hedging Instruments [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Assumptions, Expected Volatility Rate     40.00%   40.00%      
Other Contract [Member] | Minimum [Member] | US GMWB Hedging Instruments [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Assumptions, Expected Volatility Rate     10.00%   10.00%      
Equity Option [Member] | US Macro Hedge Program [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Valuation Techniques     Option model   Option model      
Fair Value Measurements, Significant Assumptions     Equity volatility   Equity volatility      
Positive or negative relationship of change in input to change in fair value measurement     Increase   Increase      
Derivative Assets (Liabilities), at Fair Value, Net 165   $ 165   $ 141      
Equity Option [Member] | US GMWB Hedging Instruments [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Valuation Techniques         Option model      
Fair Value Measurements, Significant Assumptions         Equity volatility      
Positive or negative relationship of change in input to change in fair value measurement         Increase      
Derivative Assets (Liabilities), at Fair Value, Net         $ 46      
Equity Option [Member] | Maximum [Member] | US Macro Hedge Program [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Assumptions, Expected Volatility Rate     28.00%   28.00%      
Equity Option [Member] | Maximum [Member] | US GMWB Hedging Instruments [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Assumptions, Expected Volatility Rate         34.00%      
Equity Option [Member] | Minimum [Member] | US Macro Hedge Program [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Assumptions, Expected Volatility Rate     15.00%   27.00%      
Equity Option [Member] | Minimum [Member] | US GMWB Hedging Instruments [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Assumptions, Expected Volatility Rate         22.00%      
Interest Rate Swap [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Valuation Techniques     Discounted cash flows   Discounted cash flows      
Fair Value Measurements, Significant Assumptions     Swap curve beyond 30 years   Swap curve beyond 30 years      
Positive or negative relationship of change in input to change in fair value measurement     Decrease   Decrease      
Derivative Assets (Liabilities), at Fair Value, Net (28)   $ (28)   $ (29)      
Interest Rate Swap [Member] | Maximum [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Unobservable Swap Curve     3.00%   3.00%      
Interest Rate Swap [Member] | Minimum [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Unobservable Swap Curve     3.00%   3.00%      
Interest Rate Swaption [Member] | Long [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Measurements, Valuation Techniques     Option model   Option model      
Fair Value Measurements, Significant Assumptions     Interest rate volatility   Interest rate volatility      
Positive or negative relationship of change in input to change in fair value measurement     Increase   Increase      
Derivative Assets (Liabilities), at Fair Value, Net 14   $ 14   $ 22      
Interest Rate Swaption [Member] | Long [Member] | Maximum [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Assumptions, Expected Volatility Rate     1.00%   1.00%      
Interest Rate Swaption [Member] | Long [Member] | Minimum [Member] | Interest Rate Contract [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value Assumptions, Expected Volatility Rate     1.00%   1.00%      
Available-for-sale Securities [Member] | Fixed Maturities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 3,391 3,774 $ 3,391 3,774 $ 3,475 3,700 4,063  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [1],[2] (1) (5) (5)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[3],[4] 1 12 7          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] (24) 10 38          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 206 239 590          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 135 146 204          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 109 136 163          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6] 55 138 204          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [6] 303 406 466          
Available-for-sale Securities [Member] | Asset-backed Securities [Member] | Fixed Maturities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 53 73 53 73 122 161 56  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [1],[2] 1   1          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[3],[4] 1   (1)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] (2) 1 2          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 28 37 71          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 3 1 4          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 13 18 13          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6]     1          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [6] 119 2 123          
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Fixed Maturities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 40 55 40 55 59 48 54  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] (4) 2 3          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 7 3 12          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 1 1 2          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 10 3 26          
Available-for-sale Securities [Member] | RMBS [Member] | Fixed Maturities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 1,540 1,295 1,540 1,295 1,281 1,463 1,328  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [1],[2]   (1)            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[3],[4] (1) 9 2          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] 1 (4)            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 135 116 445          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 47 50 93          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 54 65 85          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6] 43   47          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [6]   39 53          
Available-for-sale Securities [Member] | Municipal [Member] | Fixed Maturities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 49 63 49 63 66 64 78  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[3],[4] 1   (1)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] (3) 1 5          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases   4            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 13   13          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   1            
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [6]   19            
Available-for-sale Securities [Member] | Corporate [Member] | Fixed Maturities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 931 1,205 931 1,205 1,040 1,112 1,243  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [1],[2] 1 (4) (1)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[3],[4]   (4) 4          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] (14) 4 42          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 18 54 23          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 30 26 29          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 26 33 33          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6] 12 133 151          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [6] 141 166 175          
Available-for-sale Securities [Member] | CMBS [Member] | Fixed Maturities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 214 471 214 471 284 268 592  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [1],[2] (1)   (1)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[3],[4] 2 7 (1)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [5]   (2) 3          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 18 25 39          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 25 47 38          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 6 16 6          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [6]   5 5          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [6] 43 93 68          
Available-for-sale Securities [Member] | Collateralized Debt Obligations [Member] | Fixed Maturities [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 564 612 564 $ 612 $ 623 $ 584 $ 712  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [1],[2] (2)   (4)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[3],[4] (2)   4          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [5] (2) 8 (17)          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements $ 16 21 25          
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [6]   $ 87 $ 47          
[1] [2]All amounts in these rows are reported in net realized capital gains (losses). The realized/unrealized gains (losses) included in net income for separate account assets are offset by an equal amount for separate account liabilities, which results in a net zero impact on net income for the Company. All amounts are before income taxes and amortization of DAC.
[2] [7]Amounts presented are for Level 3 only and therefore may not agree to other disclosures included herein.
[3] [1]The Company classifies gains and losses on GMWB reinsurance derivatives and GMWB embedded derivatives as unrealized gains (losses) for purposes of disclosure in this table because it is impracticable to track on a contract-by-contract basis the realized gains (losses) for these derivatives and embedded derivatives.
[4] [6]Includes both market and non-market impacts in deriving realized and unrealized gains (losses).
[5] [3]All amounts are before income taxes and amortization of DAC.
[6] [4]Transfers in and/or (out) of Level 3 are primarily attributable to the availability of market observable information and the re-evaluation of the observability of pricing inputs.
[7] Conversely, the impact of a decrease in input would have the opposite impact to the fair value as that presented in the table.
[8] [2]Range represents assumed cumulative percentages of policyholders taking withdrawals.
[9] Range represents assumed cumulative annual amount withdrawn by policyholders.
[10] Range represents assumed annual percentages of full surrender of the underlying variable annuity contracts across all policy durations for in force business.
[11] Range represents assumed cumulative percentages of policyholders that would elect to reset their guaranteed benefit base.
[12] Range represents implied market volatilities for equity indices based on multiple pricing sources.
[13] 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).