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Fair Value Measurements Level 4 Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 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 $ 2,654   $ 2,874  
Available-for-sale Securities, Debt Securities 60,693   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, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 154   139  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[2],[3] 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) [4] 4      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 38      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 5      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 10      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [5] 3      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [5] 15      
Available-for-sale Securities, Debt Securities 3,554   3,313  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) [2],[6]   $ 1    
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 14 85 $ 16 $ 92
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) (1) (1)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (2) (5)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 5 12    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 1      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   4    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 $ 4 10    
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 1035.00%   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 31.00%   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 409.00%   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 725.00%   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 62.00%   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 298.00%   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 219.00%   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 219.00%   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 219.00%   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 1281.00%   1696.00%  
Fair Value Inputs, Prepayment Rate 20.00%   20.00%  
Fair Value Inputs, Probability of Default 10.00%   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 34.00%   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 40.00%   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 217.00%   178.00%  
Fair Value Inputs, Prepayment Rate 3.00%   2.00%  
Fair Value Inputs, Probability of Default 0.00%   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 $ 2,665   $ 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 32   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 1,189   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 76   60  
RMBS [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Available-for-sale Securities, Debt Securities 4,338   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 1,886   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 12,303   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 50   49  
Corporate [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Available-for-sale Securities, Debt Securities 27,297   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 834   854  
CMBS [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Available-for-sale Securities, Debt Securities 5,224   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 134   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] 3,107   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 542   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 1,886   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 32   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 320   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 $ 115   $ 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 $ 150   $ 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%  
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 $ 178   $ 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 $ 28   $ 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 27.00%   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 29.00%   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 26.00%   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 $ (32)   $ (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 $ 4   $ 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 2.00%   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 2.00%   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)   $ (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, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 3,554 3,700 $ 3,313 3,475
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [2],[6] (14) (5)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[2],[3] (14) (8)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [4] (23) (14)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 417 384    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 74 69    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 27 54    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [5] 65 149    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [5] 103 163    
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 32 161 37 122
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases   43    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 3 1    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [5] 5 1    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [5] 7 4    
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 76 48 60 59
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [4] 5 1    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 14 5    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 1 1    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 2 16    
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 1,886 1,463 1,622 1,281
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [2],[6]   (1)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[2],[3]   (1)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [4] (14) (1)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 333 310    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 57 46    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   31    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [5] 2 4    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [5]   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 50 64 49 66
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [4] 1 (2)    
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 834 1,112 854 1,040
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [2],[6] (13) (2)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[2],[3] (13) (4)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [4] (7) (28)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 30 5    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 5 (1)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 25 7    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [5] 58 139    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [5] 58 34    
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 134 268 150 284
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [2],[6] (1) (1)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[2],[3] (1) (1)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [4] (8) (3)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 40 21    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 9 13    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 [5]   5    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [5] 38 25    
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 542 584 541 623
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [2],[6]   (1)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings [1],[2],[3]   (2)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) [4]   19    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements (1) 9    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 [5]   47    
UNITED STATES | Reinsurance Recoverable [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 99 65 $ 83 $ 56
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Period Increase (Decrease) [2],[6] 12 4    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings 12 4 [1],[2],[3]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements $ (4) $ (5)    
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 8.00%   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 4.00%   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 29.00%   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 5.00%   4.00%  
[1] [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.
[2] [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.
[3] [6]Includes both market and non-market impacts in deriving realized and unrealized gains (losses).
[4] [3]All amounts are before income taxes and amortization of DAC.
[5] [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.
[6] [7]Amounts presented are for Level 3 only and therefore may not agree to other disclosures included herein
[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).