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Fair Value Measurements Level 4 Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 2,220 $ 2,140 $ 2,611
Alternative Investments, Fair Value Disclosure 930 1,216  
Available-for-sale Securities, Debt Securities 23,819 24,657  
Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 201 139 112
Available-for-sale Securities, Debt Securities 1,684 1,625  
Fair Value, Inputs, Level 1 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 230 123  
Fair Value, Inputs, Level 2 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities $ 21,905 $ 22,909  
Other Contract [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements valuation techniques Discounted  cash flows Discounted  cash flows  
Fair value measurements significant assumptions Equity volatility Equity volatility  
Fair Value Measurements, Sensitivity Analysis, Description Increase Increase  
Fair Value Inputs [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net $ 100 $ 131  
Interest Rate Swap [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
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  
Fair Value Measurements, Sensitivity Analysis, Description Decrease Decrease  
Fair Value Inputs [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net $ (29) $ (30)  
Variance Swap [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements valuation techniques Option model Option model  
Fair value measurements significant assumptions Equity volatility Equity volatility  
Fair Value Measurements, Sensitivity Analysis, Description Increase Increase  
Fair Value Inputs [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net $ (36) $ (31)  
Equity Option [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements valuation techniques Option model Option model  
Fair value measurements significant assumptions Equity volatility Equity volatility  
Fair Value Measurements, Sensitivity Analysis, Description Increase Increase  
Fair Value Inputs [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net $ 188 $ 179  
Maximum [Member] | Other Contract [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Assumptions, Expected Volatility Rate 30.00% 40.00%  
Maximum [Member] | Interest Rate Swap [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Measurements, Unobservable Swap Curve 3.00% 3.00%  
Maximum [Member] | Variance Swap [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Assumptions, Expected Volatility Rate 23.00% 21.00%  
Maximum [Member] | Equity Option [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Assumptions, Expected Volatility Rate 28.00% 28.00%  
Minimum [Member] | Other Contract [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Assumptions, Expected Volatility Rate 12.00% 10.00%  
Minimum [Member] | Interest Rate Swap [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Measurements, Unobservable Swap Curve 3.00% 3.00%  
Minimum [Member] | Variance Swap [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Assumptions, Expected Volatility Rate 20.00% 19.00%  
Minimum [Member] | Equity Option [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Assumptions, Expected Volatility Rate 17.00% 14.00%  
Derivative [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 218 $ 253 286
Fair Value Inputs [Abstract]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (107) (55)  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 71    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements (6) (33)  
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   6  
Derivative [Member] | Interest Rate Contract [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs (30) (29) (27)
Fair Value Inputs [Abstract]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (1) (1)  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 0 (1)  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 0 0  
Derivative [Member] | US Macro Hedge Program [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 167 147 141
Fair Value Inputs [Abstract]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (38) (41)  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 63 47  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements (6) 0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3 0    
Derivative [Member] | US GMWB Hedging Instruments [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 81 135 170
Fair Value Inputs [Abstract]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (60) (16)  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 0    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 0 (19)  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3   0  
Derivative [Member] | Other Contract [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   0 0
Fair Value Inputs [Abstract]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases   0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements   0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Sales   0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers into Level 3   0  
Derivative [Member] | Equity Contract [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs 0 0 5
Fair Value Inputs [Abstract]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings (8) 5  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Purchases 8 0  
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements   (10)  
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  
Commercial Mortgage Backed Securities [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements valuation techniques Discounted cash flows Discounted cash flows  
Fair Value Measurements, Sensitivity Analysis, Description Decrease Decrease  
Commercial Mortgage Backed Securities [Member] | Maximum [Member] | Level 3 [Member]      
Fair Value Inputs [Abstract]      
Fair Value Inputs, Counterparty Credit Risk 1273.00% 1505.00%  
Commercial Mortgage Backed Securities [Member] | Minimum [Member] | Level 3 [Member]      
Fair Value Inputs [Abstract]      
Fair Value Inputs, Counterparty Credit Risk 10.00% 31.00%  
Commercial Mortgage Backed Securities [Member] | Weighted Average [Member] | Level 3 [Member]      
Fair Value Inputs [Abstract]      
Fair Value Inputs, Counterparty Credit Risk 249.00% 230.00%  
Corporate [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements valuation techniques Discounted cash flows Discounted cash flows  
Fair Value Measurements, Sensitivity Analysis, Description Decrease Decrease  
Corporate [Member] | Maximum [Member] | Level 3 [Member]      
Fair Value Inputs [Abstract]      
Fair Value Inputs, Counterparty Credit Risk 1021.00% 800.00%  
Corporate [Member] | Minimum [Member] | Level 3 [Member]      
Fair Value Inputs [Abstract]      
Fair Value Inputs, Counterparty Credit Risk 122.00% 63.00%  
Corporate [Member] | Weighted Average [Member] | Level 3 [Member]      
Fair Value Inputs [Abstract]      
Fair Value Inputs, Counterparty Credit Risk 373.00% 290.00%  
US States and Political Subdivisions Debt Securities [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements valuation techniques Discounted cash flows Discounted cash flows  
Fair Value Measurements, Sensitivity Analysis, Description Decrease Decrease  
US States and Political Subdivisions Debt Securities [Member] | Maximum [Member] | Level 3 [Member]      
Fair Value Inputs [Abstract]      
Fair value inputs treasury yield 286.00% 193.00%  
US States and Political Subdivisions Debt Securities [Member] | Minimum [Member] | Level 3 [Member]      
Fair Value Inputs [Abstract]      
Fair value inputs treasury yield 135.00% 193.00%  
US States and Political Subdivisions Debt Securities [Member] | Weighted Average [Member] | Level 3 [Member]      
Fair Value Inputs [Abstract]      
Fair value inputs treasury yield 195.00% 193.00%  
Residential Mortgage Backed Securities [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements valuation techniques Discounted cash flows Discounted cash flows  
Residential Mortgage Backed Securities [Member] | Maximum [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Inputs, Loss Severity 0.00% 0.00%  
Fair Value Inputs, Probability of Default 10.00% 10.00%  
Fair Value Inputs, Prepayment Rate 20.00% 20.00%  
Fair Value Inputs [Abstract]      
Fair Value Inputs, Counterparty Credit Risk 1830.00% 1696.00%  
Residential Mortgage Backed Securities [Member] | Minimum [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Inputs, Loss Severity 0.00% 0.00%  
Fair Value Inputs, Probability of Default 1.00% 1.00%  
Fair Value Inputs, Prepayment Rate 0.00% 0.00%  
Fair Value Inputs [Abstract]      
Fair Value Inputs, Counterparty Credit Risk 16.00% 30.00%  
Residential Mortgage Backed Securities [Member] | Weighted Average [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Inputs, Loss Severity 0.00% 0.00%  
Fair Value Inputs, Probability of Default 5.00% 6.00%  
Fair Value Inputs, Prepayment Rate 4.00% 3.00%  
Fair Value Inputs [Abstract]      
Fair Value Inputs, Counterparty Credit Risk 189.00% 172.00%  
Spread [Member] | Commercial Mortgage Backed Securities [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
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] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements significant assumptions Spread Spread  
Spread [Member] | US States and Political Subdivisions Debt Securities [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements significant assumptions Spread Spread  
Spread [Member] | Residential Mortgage Backed Securities [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements significant assumptions Spread Spread  
Fair Value Measurements, Sensitivity Analysis, Description Decrease Decrease  
Withdrawal Utilization [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Measurements, Sensitivity Analysis, Description Increase Increase  
Withdrawal Utilization [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Unobservable Input Range 100.00% 100.00%  
Withdrawal Utilization [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Unobservable Input Range 15.00% 20.00%  
Withdrawal Rates [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Measurements, Sensitivity Analysis, Description Increase Increase  
Withdrawal Rates [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Unobservable Input Range 8.00% 8.00%  
Withdrawal Rates [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Unobservable Input Range 0.00% 0.00%  
Lapse Rates [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Measurements, Sensitivity Analysis, Description Decrease Decrease  
Lapse Rates [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Unobservable Input Range 40.00% 75.00%  
Lapse Rates [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Unobservable Input Range 0.00% 0.00%  
Reset Elections [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Measurements, Sensitivity Analysis, Description Increase Increase  
Reset Elections [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Unobservable Input Range 75.00% 75.00%  
Reset Elections [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Unobservable Input Range 20.00% 20.00%  
Equity Volatility [Member] | Other Contract [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Measurements, Sensitivity Analysis, Description Increase Increase  
Equity Volatility [Member] | Maximum [Member] | Other Contract [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Unobservable Input Range 30.00% 40.00%  
Equity Volatility [Member] | Minimum [Member] | Other Contract [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Unobservable Input Range 12.00% 10.00%  
Prepayment Rate [Member] | Residential Mortgage Backed Securities [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements significant assumptions Constant prepayment rate Constant prepayment rate  
Fair Value Measurements, Sensitivity Analysis, Description Decrease [5] Decrease [5]  
Probability of Default [Member] | Residential Mortgage Backed Securities [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements significant assumptions Constant default rate Constant default rate  
Fair Value Measurements, Sensitivity Analysis, Description Decrease Decrease  
Loss Severity [Member] | Residential Mortgage Backed Securities [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements significant assumptions Loss severity Loss severity  
Fair Value Measurements, Sensitivity Analysis, Description Decrease Decrease  
Fair Value, Measurements, Recurring [Member] | Equity Contract [Member]      
Fair Value Inputs [Abstract]      
Derivative Asset   $ 0  
Fair Value, Measurements, Recurring [Member] | Equity Contract [Member] | Level 3 [Member]      
Fair Value Inputs [Abstract]      
Derivative Asset   0  
Fair Value, Measurements, Recurring [Member] | Equity Contract [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Inputs [Abstract]      
Derivative Asset   0  
Fair Value, Measurements, Recurring [Member] | Equity Contract [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value Inputs [Abstract]      
Derivative Asset   0  
Residential Mortgage Backed Securities [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities $ 1,760 1,503  
Residential Mortgage Backed Securities [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 711 628  
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 0 0  
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 1,049 875  
Residential Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 704 628  
US States and Political Subdivisions Debt Securities [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 1,189 1,132  
US States and Political Subdivisions Debt Securities [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 72 49  
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 0 0  
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 1,117 1,083  
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Non-Broker Priced [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 56 31  
Corporate [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 14,693 15,175  
Corporate [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 566 534  
Corporate [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 0 0  
Corporate [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 14,127 14,641  
Corporate [Member] | Fair Value, Measurements, Recurring [Member] | Non-Broker Priced [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 265 213  
Commercial Mortgage Backed Securities [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 2,146 1,964  
Commercial Mortgage Backed Securities [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 21 62  
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 0 0  
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 2,125 1,902  
Commercial Mortgage Backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Available-for-sale Securities, Debt Securities 9 61  
Available-for-sale Securities [Member] | Equity Securities [Member] | Level 3 [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 44 $ 38 48
Hedge Funds, Equity [Member] | Equity Option [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair value measurements valuation techniques Option model Option model  
Fair value measurements significant assumptions Equity volatility Equity volatility  
Fair Value Measurements, Sensitivity Analysis, Description Increase Increase  
Fair Value Inputs [Abstract]      
Derivative Assets (Liabilities), at Fair Value, Net $ 17 $ 35  
Hedge Funds, Equity [Member] | Maximum [Member] | Equity Option [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Assumptions, Expected Volatility Rate 30.00% 29.00%  
Hedge Funds, Equity [Member] | Minimum [Member] | Equity Option [Member] | Level 3 [Member]      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]      
Fair Value Assumptions, Expected Volatility Rate 27.00% 27.00%  
Guaranteed Minimum Withdrawal Benefit [Member] | Reinsurance Recoverable [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   $ 83 $ 56