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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2014
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 $ 2,578   $ 2,578   $ 2,874      
Available-for-sale Securities, Debt Securities 61,241   61,241   59,196      
Fair Value, Inputs, Level 3 [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [1] 3 $ (1) 7 $ (1)        
Available-for-sale Securities, Debt Securities 3,769   3,769   3,313      
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, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs [2] 279 291 279 291 $ 267 $ 271 $ 336 $ 313
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [2],[3],[4],[5] 2 (67) (8) (49)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases [2]   (6) 16 34        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements [2]   5 2 40        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [2],[6]   10   10        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [2],[6] (6) (23) $ (6) (23)        
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     1275.00%   1505.00%      
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     10.00%   31.00%      
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     344.00%   266.00%      
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     1750.00%   800.00%      
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     158.00%   63.00%      
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     401.00%   306.00%      
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     283.00%   193.00%      
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     223.00%   193.00%      
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     245.00%   193.00%      
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     1896.00%   1696.00%      
Fair Value Inputs, Prepayment Rate     20.00%   20.00%      
Fair Value Inputs, Probability of Default     11.00%   10.00%      
Fair Value Inputs, Loss Severity     0.00%   0.00%      
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     54.00%   30.00%      
Fair Value Inputs, Prepayment Rate     0.00%   0.00%      
Fair Value Inputs, Probability of Default     1.00%   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     212.00%   178.00%      
Fair Value Inputs, Prepayment Rate     3.00%   2.00%      
Fair Value Inputs, Probability of Default     6.00%   6.00%      
Fair Value Inputs, Loss Severity     0.00%   0.00%      
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   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%   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%   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   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%   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%   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   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%   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%   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   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%   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%   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   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]     30.00%   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]     12.00%   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 2,777   $ 2,777   $ 2,499      
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 41   41   37      
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 1,188   1,188   1,308      
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 72   72   60      
RMBS [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 4,826   4,826   4,046      
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 1,873   1,873   1,622      
Municipal [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 12,611   12,611   12,121      
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 90   90   49      
Corporate [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 27,158   27,158   26,802      
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 1,136   1,136   854      
CMBS [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Available-for-sale Securities, Debt Securities 5,195   5,195   4,717      
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 79   79   150      
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] 2,867   2,867   3,038      
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 478   478   541      
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 1,873   1,873   1,622      
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 72   72   31      
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 590   590   339      
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 58   $ 58   $ 122      
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 166   $ 166   $ 131      
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     30.00%   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     12.00%   10.00%      
Other Contract [Member] | 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, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 4 9 $ 4 9 $ 7 5 11 12
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] (1) (2) $ (3) (3)        
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 175   $ 175   $ 179      
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   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 33   $ 33   $ 35      
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     30.00%   29.00%      
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     12.00%   14.00%      
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     27.00%   27.00%      
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 (34)   $ (34)   $ (30)      
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     2.00%   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     2.00%   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 2   $ 2   $ 8      
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%   2.00%      
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%      
Variance Swap [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   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 (34)   $ (34)   $ (31)      
Variance Swap [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     24.00%   21.00%      
Variance Swap [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%   19.00%      
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, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [1] 40 (24) $ 17 (38)        
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, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [1]   (2)   (2)        
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, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [1] 4 (4) 9 (3)        
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, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [1] 10 1 (4)          
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, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [1] 4 (3) 5 (5)        
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, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [1] 19 (14) 12 (42)        
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, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [1] 5   (3) (3)        
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, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [1] (2) (2) (2) 17        
UNITED STATES | Derivative [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, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 141 165 141 165 $ 147 145 187 141
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] (4) (22) (4) (23)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases       47        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements     2          
UNITED STATES | Derivative [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, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 165 125 165 125 $ 135 $ 144 $ 159 $ 170
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [3],[4],[5] 15 $ (34) 24 (25)        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements       $ 20        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [6] $ (6)   $ (6)          
Hedge Funds [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Percentage         9.00%      
Private Equity Funds [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Percentage         3.00%      
Separate Accounts [Member] | Hedge Funds [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Percentage 35.00%   35.00%   28.00%      
Separate Accounts [Member] | Private Equity Funds [Member]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Percentage 9.00%   9.00%   4.00%      
[1] [3]All amounts are before income taxes and amortization of DAC.
[2] [5]Derivative instruments are reported in this table on a net basis for asset (liability) positions and reported in the Condensed Consolidated Balance Sheets in other investments and other liabilities.
[3] [1]The Company classifies realized and unrealized gains (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] [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.
[5] [6]Includes both market and non-market impacts in deriving realized and unrealized gains (losses).
[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 derivatives within certain securities. Subsequent changes in value are recorded in net realized capital gains (losses).