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Fair Value Measurements Level 4 Significant Unobservable Inputs (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value Inputs, Comparability Adjustments 0.00%      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 4,491,000,000 $ 4,184,000,000 $ 4,422,000,000 $ 3,911,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (60,000,000) (15,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 33,000,000 (17,000,000)    
Alternative Investments, Fair Value Disclosure 2,418,000,000   2,456,000,000  
Available-for-sale Securities, Debt Securities 56,326,000,000   56,003,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 553,000,000 476,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (144,000,000) (78,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (194,000,000) (39,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 69,000,000 68,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (188,000,000) (122,000,000)    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (66,000,000) (15,000,000)    
Business Combination, Contingent Consideration, Liability 60      
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 Value 277,000,000 154,000,000 201,000,000 139,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 3,000,000 (4,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (219,000,000)   (299,000,000) (288,000,000)
Available-for-sale Securities, Debt Securities 3,870,000,000   3,810,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 96,000,000      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (16,000,000)      
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 96,000,000 (81,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 97,000,000 38,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (4,000,000) (5,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (8,000,000) (10,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 3,000,000 3,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 15,000,000 (15,000,000)    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0      
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 185,000,000 271,000,000 228,000,000 267,000,000
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (48,000,000) (10,000,000)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 5,000,000 16,000,000    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 0 (2,000,000)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 0 0    
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 Value 0 14,000,000 $ 11,000,000 16,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 (2,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 4,000,000 5,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (2,000,000) (1,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (13,000,000) 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 4,000,000    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) $ 0 (1,000,000)    
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  
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 1272.00%   1273.00%  
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 9.00%   10.00%  
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 463.00%   366.00%  
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  
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 963.00%   1302.00%  
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 107.00%   122.00%  
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 328.00%   359.00%  
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  
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 241.00%   286.00%  
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 186.00%   135.00%  
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 208.00%   221.00%  
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 1371.00%   1830.00%  
Fair Value Inputs, Prepayment Rate 20.00%   20.00%  
Fair Value Inputs, Probability of Default 10.00%   11.00%  
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 34.00%   16.00%  
Fair Value Inputs, Prepayment Rate 0.00%   0.00%  
Fair Value Inputs, Probability of Default 1.00%   0.00%  
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 179.00%   192.00%  
Fair Value Inputs, Prepayment Rate 4.00%   4.00%  
Fair Value Inputs, Probability of Default 5.00%   5.00%  
Fair Value Inputs, Loss Severity 73.00%   75.00%  
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, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 60,000,000   $ 73,000,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (17,000,000)      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (4,000,000)      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 $ 0      
Spread [Member] | 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, Significant Assumptions Spread (encompasses prepayment, default risk and loss severity)   Spread (encompasses prepayment, default risk and loss severity)  
Spread [Member] | 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, Significant Assumptions Spread   Spread  
Spread [Member] | 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, Significant Assumptions Spread   Spread  
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  
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 [5]   Decrease [5]  
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 $ 2,265,000,000   $ 2,382,000,000  
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 125,000,000   82,000,000  
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 1,187,000,000   1,171,000,000  
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 66,000,000   64,000,000  
RMBS [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Available-for-sale Securities, Debt Securities 3,921,000,000   4,767,000,000  
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 2,048,000,000   1,972,000,000  
Municipal [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Available-for-sale Securities, Debt Securities 11,780,000,000   11,486,000,000  
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 117,000,000   118,000,000  
Corporate [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Available-for-sale Securities, Debt Securities 25,730,000,000   25,666,000,000  
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 1,078,000,000   1,080,000,000  
CMBS [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Available-for-sale Securities, Debt Securities 5,099,000,000   4,936,000,000  
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 117,000,000   80,000,000  
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 2,311,000,000   1,916,000,000  
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 319,000,000   414,000,000  
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 2,038,000,000   1,963,000,000  
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 101,000,000   101,000,000  
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 438,000,000   510,000,000  
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 $ 76,000,000   $ 52,000,000  
Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Withdrawal Utilization [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 Increase   Increase  
Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Withdrawal Utilization [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 Unobservable Input Range 100.00%   100.00%  
Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Withdrawal Utilization [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 Unobservable Input Range 15.00%   15.00%  
Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Withdrawal Rates [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 Increase   Increase  
Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Withdrawal Rates [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 Unobservable Input Range 8.00%   8.00%  
Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Withdrawal Rates [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 Unobservable Input Range 0.00%   0.00%  
Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Lapse Rates [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 Decrease   Decrease  
Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Lapse Rates [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 Unobservable Input Range 40.00%   40.00%  
Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Lapse Rates [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 Unobservable Input Range 0.00%   0.00%  
Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Reset Elections [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 Increase   Increase  
Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Reset Elections [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 Unobservable Input Range 75.00%   75.00%  
Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Reset Elections [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 Unobservable Input Range 20.00%   20.00%  
Equity 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 $ 4,000,000 5,000,000 $ 0 0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (1,000,000) (11,000,000)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 5,000,000 16,000,000    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 $ 0 0    
Other 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 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 $ 76,000,000   $ 100,000,000  
Other Contract [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 Assumptions, Expected Volatility Rate 30.00%   30.00%  
Other Contract [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 Assumptions, Expected Volatility Rate 9.00%   12.00%  
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 $ 0 5,000,000 $ 1,000,000 7,000,000
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (1,000,000) (2,000,000)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 $ 0 0    
Other Contract [Member] | Equity Volatility [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 Increase   Increase  
Other Contract [Member] | Equity Volatility [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 Unobservable Input Range 30.00%   30.00%  
Other Contract [Member] | Equity Volatility [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 Unobservable Input Range 9.00%   12.00%  
Equity Option [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 $ 164,000,000   $ 188,000,000  
Equity Option [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 Assumptions, Expected Volatility Rate 32.00%   28.00%  
Equity Option [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 Assumptions, Expected Volatility Rate 15.00%   17.00%  
Interest Rate Swap [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 $ (29,000,000)   $ (29,000,000)  
Interest Rate Swap [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 Measurements, Unobservable Swap Curve 3.00%   3.00%  
Interest Rate Swap [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 Measurements, Unobservable Swap Curve 3.00%   3.00%  
Interest Rate Swaption [Member] | Long [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 $ 5,000,000   $ 8,000,000  
Interest Rate Swaption [Member] | Long [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 Assumptions, Expected Volatility Rate 2.00%   2.00%  
Interest Rate Swaption [Member] | Long [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 Assumptions, Expected Volatility Rate 2.00%   2.00%  
Variance Swap [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 $ (39,000,000)   $ (36,000,000)  
Variance Swap [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 Assumptions, Expected Volatility Rate 20.00%   23.00%  
Variance Swap [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 Assumptions, Expected Volatility Rate 16.00%   20.00%  
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, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   99,000,000   83,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   12,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   (4,000,000)    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) $ (17,000,000) 12,000,000    
U.S. Macro Hedge Program [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 159,000,000 145,000,000 $ 167,000,000 147,000,000
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (8,000,000) 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 0 (2,000,000)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 0 0    
U.S. GMWB Hedging Instruments [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 46,000,000 144,000,000 81,000,000 135,000,000
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (35,000,000) 9,000,000    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 0 0    
Interest Rate 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 (24,000,000) (28,000,000) (21,000,000) (22,000,000)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (3,000,000) (6,000,000)    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 0 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers out of Level 3 0 0    
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 Value 3,870,000,000 3,554,000,000 3,810,000,000 3,313,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 5,000,000 (14,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 34,000,000 (23,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 443,000,000 417,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (142,000,000) (74,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (173,000,000) (27,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 66,000,000 65,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 173,000,000 103,000,000    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (1,000,000) (14,000,000)    
Available-for-sale Securities [Member] | Equity Securities [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 Value 99,000,000 92,000,000 99,000,000 93,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 (1,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (4,000,000) 2,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 4,000,000 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 (2,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 (1,000,000)    
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 Value 125,000,000 32,000,000 82,000,000 37,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 45,000,000      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (5,000,000) (3,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 26,000,000 5,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 23,000,000 7,000,000    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0    
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 Value 66,000,000 76,000,000 64,000,000 60,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 3,000,000 5,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 14,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (1,000,000) (1,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 (2,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0      
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 Value 2,048,000,000 1,886,000,000 1,972,000,000 1,622,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 6,000,000 (14,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 173,000,000 333,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (96,000,000) (57,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (7,000,000) 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 2,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0      
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 Value 117,000,000 50,000,000 118,000,000 49,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 5,000,000 1,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (6,000,000)      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0    
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 Value 1,078,000,000 834,000,000 1,080,000,000 854,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 6,000,000 (13,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 16,000,000 (7,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 169,000,000 30,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (36,000,000) (5,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales (160,000,000) (25,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 40,000,000 58,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 37,000,000 (58,000,000)    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 (13,000,000)    
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 Value 117,000,000 134,000,000 80,000,000 150,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (1,000,000) (1,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 (8,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 56,000,000 40,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (3,000,000) (9,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 15,000,000 38,000,000    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (1,000,000) (1,000,000)    
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 Value 319,000,000 542,000,000 $ 414,000,000 541,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 4,000,000 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements (1,000,000) (1,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 98,000,000 0    
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) $ 0 0    
Hedge Funds, Equity [Member] | Equity Option [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  
Derivative Assets (Liabilities), at Fair Value, Net $ 9,000,000   $ 17,000,000  
Hedge Funds, Equity [Member] | Equity Option [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 Assumptions, Expected Volatility Rate 28.00%   30.00%  
Hedge Funds, Equity [Member] | Equity Option [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 Assumptions, Expected Volatility Rate 26.00%   27.00%  
Other Policyholder Funds and Benefits Payable [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, Liability, Gain (Loss) Included in Earnings $ 97,000,000 (81,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (16,000,000) (17,000,000)    
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) 97,000,000 (81,000,000)    
Other Policyholder Funds and Benefits Payable [Member] | 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]        
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value (193,000,000) (386,000,000) $ (274,000,000) (288,000,000)
Other Liabilities [Member] | Equity Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net 37,000,000      
Other Liabilities [Member] | Equity Contract [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net 0      
Other Liabilities [Member] | Equity Contract [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net     33,000,000  
Other Liabilities [Member] | Equity Contract [Member] | 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]        
Derivative Assets (Liabilities), at Fair Value, Net     0  
Other Liabilities [Member] | Macro Hedge Program [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net 58,000,000   50,000,000  
Other Liabilities [Member] | 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]        
Derivative Assets (Liabilities), at Fair Value, Net 55,000,000   47,000,000  
Other Liabilities [Member] | U.S. GMWB Hedging Instruments [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net 3,000,000   20,000,000  
Other Liabilities [Member] | U.S. 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]        
Derivative Assets (Liabilities), at Fair Value, Net 2,000,000   21,000,000  
Other Liabilities [Member] | Interest Rate Contract [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net (517,000,000)      
Other Liabilities [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]        
Derivative Assets (Liabilities), at Fair Value, Net $ (29,000,000)      
Other Liabilities [Member] | Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative Assets (Liabilities), at Fair Value, Net     (542,000,000)  
Other Liabilities [Member] | Interest Rate Contract [Member] | 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]        
Derivative Assets (Liabilities), at Fair Value, Net     $ (21,000,000)  
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 42.00%   39.00%  
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 12.00%   11.00%  
Equity Linked Notes [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 Reconciliations, Recurring Basis, Liability Value $ (36,000,000) (25,000,000) $ (33,000,000) (26,000,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (3,000,000) 1,000,000    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 0 0    
Equity Linked Notes [Member] | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) (3,000,000) 1,000,000    
Obligations [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 Reconciliations, Recurring Basis, Liability Value (26,000,000) (386,000,000) (25,000,000)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings (1,000,000) (81,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)   0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements 0 (17,000,000)    
Obligations [Member] | Other Liabilities [Member] | 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]        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) (1,000,000) 0    
Guaranteed Minimum Withdrawal Benefit [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 Reconciliations, Recurring Basis, Liability Value 157,000,000 (361,000,000) $ (241,000,000) $ (262,000,000)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings 100,000,000 (82,000,000)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements (16,000,000) (17,000,000)    
Guaranteed Minimum Withdrawal Benefit [Member] | Other Policyholder Funds and Benefits Payable [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss) $ 100,000,000 $ (82,000,000)    
Eighteen point eight percent discount rate [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Significant Inputs 18.8%.