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Fair Value Measurements Level 4 Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Fair Value Inputs, Comparability Adjustments 0.00%   0.00%          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 2,089 $ 2,378 $ 2,089 $ 2,378 $ 2,220 $ 2,249 $ 2,240 $ 2,140
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (22) 9 (81) 23        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (22) 8 (74) 16        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 16 30 33 14        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 169 98 463 288        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 156 156 202 194        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 48 43 120 58        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 59 279 70 328        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 178 78 301 156        
Available-for-sale Securities, Debt Securities 24,114   24,114   23,819      
Level 3 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 192 171 192 171 201 277 154 139
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) 0 0 1          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 2 0 3          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 3 2 (7)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 13 22 111 61        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 2 3 7 9        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 34 6 42 16        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 7 3 10 6        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (71) (2) (86) 17        
Available-for-sale Securities, Debt Securities 1,626   1,626   1,684      
Level 3 [Member] | Reinsurance Recoverable [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   106   106     99 83
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (7) 3 (23) 16        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   3   16        
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   7        
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            
Level 3 [Member] | Other Contract [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Derivative Assets (Liabilities), at Fair Value, Net 73   $ 73   $ 100      
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      
Level 3 [Member] | Interest Rate Swap [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Derivative Assets (Liabilities), at Fair Value, Net (29)   $ (29)   $ (29)      
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      
Level 3 [Member] | Variance Swap [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Derivative Assets (Liabilities), at Fair Value, Net (39)   $ (39)   $ (36)      
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      
Level 3 [Member] | Equity Option [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Derivative Assets (Liabilities), at Fair Value, Net 171   $ 171   $ 188      
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      
Level 3 [Member] | Maximum [Member] | Other Contract [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Assumptions, Expected Volatility Rate     30.00%   30.00%      
Level 3 [Member] | Maximum [Member] | Interest Rate Swap [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Measurements, Unobservable Swap Curve     3.00%   3.00%      
Level 3 [Member] | Maximum [Member] | Variance Swap [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Assumptions, Expected Volatility Rate     20.00%   23.00%      
Level 3 [Member] | Maximum [Member] | Equity Option [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Assumptions, Expected Volatility Rate     26.00%   28.00%      
Level 3 [Member] | Minimum [Member] | Other Contract [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Assumptions, Expected Volatility Rate     9.00%   12.00%      
Level 3 [Member] | Minimum [Member] | Interest Rate Swap [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Measurements, Unobservable Swap Curve     3.00%   3.00%      
Level 3 [Member] | Minimum [Member] | Variance Swap [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Assumptions, Expected Volatility Rate     16.00%   20.00%      
Level 3 [Member] | Minimum [Member] | Equity Option [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Assumptions, Expected Volatility Rate     15.00%   17.00%      
Level 3 [Member] | Fixed Maturities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   0   0     1 2
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)   0   0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases   0   1        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements   0   0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales   1   1        
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   (2)        
Level 3 [Member] | CMBS [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      
Level 3 [Member] | CMBS [Member] | Maximum [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Inputs Counterparty Credit Risk     1816.00%   1273.00%      
Level 3 [Member] | CMBS [Member] | Minimum [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Inputs Counterparty Credit Risk     9.00%   10.00%      
Level 3 [Member] | CMBS [Member] | Weighted Average [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Inputs Counterparty Credit Risk     476.00%   249.00%      
Level 3 [Member] | Corporate [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      
Level 3 [Member] | Corporate [Member] | Maximum [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Inputs Counterparty Credit Risk     944.00%   1021.00%      
Level 3 [Member] | Corporate [Member] | Minimum [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Inputs Counterparty Credit Risk     108.00%   122.00%      
Level 3 [Member] | Corporate [Member] | Weighted Average [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Inputs Counterparty Credit Risk     328.00%   373.00%      
Level 3 [Member] | Municipal [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      
Level 3 [Member] | Municipal [Member] | Maximum [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Inputs Treasury Yield     222.00%   286.00%      
Level 3 [Member] | Municipal [Member] | Minimum [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Inputs Treasury Yield     166.00%   135.00%      
Level 3 [Member] | Municipal [Member] | Weighted Average [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Inputs Treasury Yield     180.00%   195.00%      
Level 3 [Member] | RMBS [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair value measurements valuation techniques     Discounted cash flows   Discounted cash flows      
Level 3 [Member] | RMBS [Member] | Maximum [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Inputs Counterparty Credit Risk     624.00%   1830.00%      
Fair Value Inputs, Prepayment Rate     14.00%   20.00%      
Fair Value Inputs, Probability of Default     10.00%   10.00%      
Fair Value Inputs, Loss Severity     100.00%   100.00%      
Level 3 [Member] | RMBS [Member] | Minimum [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Inputs Counterparty Credit Risk     40.00%   16.00%      
Fair Value Inputs, Prepayment Rate     0.00%   0.00%      
Fair Value Inputs, Probability of Default     2.00%   1.00%      
Fair Value Inputs, Loss Severity     0.00%   0.00%      
Level 3 [Member] | RMBS [Member] | Weighted Average [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Inputs Counterparty Credit Risk     126.00%   189.00%      
Fair Value Inputs, Prepayment Rate     5.00%   4.00%      
Fair Value Inputs, Probability of Default     5.00%   5.00%      
Fair Value Inputs, Loss Severity     71.00%   75.00%      
Fair Value, Inputs, Level 1 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 162   $ 162   $ 230      
Fair Value, Inputs, Level 2 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 22,326   $ 22,326   $ 21,905      
Withdrawal Utilization [Member] | Level 3 [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Measurements, Sensitivity Analysis, Description     Increase   Increase      
Withdrawal Utilization [Member] | Level 3 [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Range of Values-Unobservable Inputs     100.00%   100.00%      
Withdrawal Utilization [Member] | Level 3 [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Range of Values-Unobservable Inputs     15.00%   15.00%      
Withdrawal Rates [Member] | Level 3 [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Measurements, Sensitivity Analysis, Description     Increase   Increase      
Withdrawal Rates [Member] | Level 3 [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Range of Values-Unobservable Inputs     8.00%   8.00%      
Withdrawal Rates [Member] | Level 3 [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Range of Values-Unobservable Inputs     0.00%   0.00%      
Spread [Member] | Level 3 [Member] | CMBS [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] | Level 3 [Member] | Corporate [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair value measurements significant assumptions     Spread   Spread      
Spread [Member] | Level 3 [Member] | Municipal [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair value measurements significant assumptions     Spread   Spread      
Spread [Member] | Level 3 [Member] | RMBS [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      
Prepayment Rate [Member] | Level 3 [Member] | RMBS [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] | Level 3 [Member] | RMBS [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] | Level 3 [Member] | RMBS [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      
Lapse Rates [Member] | Level 3 [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Measurements, Sensitivity Analysis, Description     Decrease   Decrease      
Lapse Rates [Member] | Level 3 [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Range of Values-Unobservable Inputs     40.00%   40.00%      
Lapse Rates [Member] | Level 3 [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Range of Values-Unobservable Inputs     0.00%   0.00%      
Reset Elections [Member] | Level 3 [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Measurements, Sensitivity Analysis, Description     Increase   Increase      
Reset Elections [Member] | Level 3 [Member] | Maximum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Range of Values-Unobservable Inputs     75.00%   75.00%      
Reset Elections [Member] | Level 3 [Member] | Minimum [Member] | Living Benefits Required to be Fair Valued and the GMWB Reinsurance Derivative [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Range of Values-Unobservable Inputs     20.00%   20.00%      
Equity Volatility [Member] | Level 3 [Member] | Other Contract [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Measurements, Sensitivity Analysis, Description     Increase   Increase      
Equity Volatility [Member] | Level 3 [Member] | Maximum [Member] | Other Contract [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Range of Values-Unobservable Inputs     30.00%   30.00%      
Equity Volatility [Member] | Level 3 [Member] | Minimum [Member] | Other Contract [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Range of Values-Unobservable Inputs     9.00%   12.00%      
US Treasury Securities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 1,816   $ 1,816   $ 1,753      
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
HLIC_FairValueAssetsLevel1ToLevel2TransfersAmount 0 0 0 0        
US Treasury Securities [Member] | Level 3 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 0   0   0      
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 162   162   230      
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 1,654   1,654   1,523      
Foreign Government Debt Securities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 375   375   345      
Foreign Government Debt Securities [Member] | Level 3 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 7   7   17      
Foreign Government 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   0      
Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 368   368   328      
Asset-backed Securities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 1,015   1,015   993      
Asset-backed Securities [Member] | Level 3 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 33   33   37      
Asset-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   0      
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 982   982   956      
RMBS [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 1,642   1,642   1,760      
RMBS [Member] | Level 3 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 739   739   711      
RMBS [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 0   0   0      
RMBS [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 903   903   1,049      
RMBS [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 731   731   704      
Municipal [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 1,210   1,210   1,189      
Municipal [Member] | Level 3 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 70   70   72      
Municipal [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 0   0   0      
Municipal [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 1,140   1,140   1,117      
Municipal [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Non-Broker Priced [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 54   54   56      
Corporate [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 14,779   14,779   14,693      
Corporate [Member] | Level 3 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 608   608   566      
Corporate [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 0   0   0      
Corporate [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 14,171   14,171   14,127      
Corporate [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Non-Broker Priced [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 279   279   265      
CMBS [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 2,266   2,266   2,146      
CMBS [Member] | Level 3 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 33   33   21      
CMBS [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 0   0   0      
CMBS [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 2,233   2,233   2,125      
CMBS [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 16   16   9      
Collateralized Debt Obligations [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 1,011   1,011   940      
Collateralized Debt Obligations [Member] | Level 3 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 136   136   260      
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 1 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 0   0   0      
Collateralized Debt Obligations [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Available-for-sale Securities, Debt Securities 875   875   680      
Available-for-sale Securities [Member] | Level 3 [Member] | Fixed Maturities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 1,626 1,786 1,626 1,786 1,684 1,692 1,690 1,625
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (12) (1) (12) (1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (12) (2) (7) (8)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 17 23 34 3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 156 74 350 216        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 158 157 202 190        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 14 36 78 39        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 52 276 60 322        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (107) (82) (215) (143)        
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Level 3 [Member] | Fixed Maturities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 7 18 7 18 17 17 20 17
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 1 1 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 1 0 1 3        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 1 1 2 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 2 0 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (10) 0 (10) 0        
Available-for-sale Securities [Member] | Asset-backed Securities [Member] | Level 3 [Member] | Fixed Maturities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 33 7 33 7 37 44 2 5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 2 0 14          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 1 0 3 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 5 3 5        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (12) 0 (18) (3)        
Available-for-sale Securities [Member] | RMBS [Member] | Level 3 [Member] | Fixed Maturities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 739 690 739 690 711 757 701 628
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 9 3 11 (2)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 21 40 106 148        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 48 44 89 76        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 (10) 0 (10)        
Available-for-sale Securities [Member] | Municipal [Member] | Level 3 [Member] | Fixed Maturities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 70 73 70 73 72 73 50 49
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 1 3 3 4        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 0 12 0 12        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 4 0 5          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 8 0 8        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 0 0 0        
Available-for-sale Securities [Member] | Corporate [Member] | Level 3 [Member] | Fixed Maturities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 608 717 608 717 566 557 538 534
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) (12) (1) (12) (1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (12) (1) (7) (7)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 8 16 19 4        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 13 19 82 34        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 0 48 1 45        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 10 32 73 35        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 52 263 57 307        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0 (38) (37) 75        
Available-for-sale Securities [Member] | CMBS [Member] | Level 3 [Member] | Fixed Maturities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 33 15 33 15 21 45 51 62
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) 1 1 1 (1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 5 3 33 19        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 1 4 2 8        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 2 0 2        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (17) (34) (20) (55)        
Available-for-sale Securities [Member] | Collateralized Debt Obligations [Member] | Level 3 [Member] | Fixed Maturities [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value 136 266 136 266 260 $ 199 $ 328 $ 330
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 (1) 0 (1)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) (2) (1) (1) (4)        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 114 0 114 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements 107 60 107 59        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 0 0 0 0        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (68) $ 0 (130) $ 0        
Hedge Funds, Equity [Member] | Level 3 [Member] | Equity Option [Member]                
Fair Value Inputs, Assets, Quantitative Information [Line Items]                
Derivative Assets (Liabilities), at Fair Value, Net $ 6   $ 6   $ 17      
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      
Hedge Funds, Equity [Member] | Level 3 [Member] | Maximum [Member] | Equity Option [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Assumptions, Expected Volatility Rate     28.00%   30.00%      
Hedge Funds, Equity [Member] | Level 3 [Member] | Minimum [Member] | Equity Option [Member]                
Fair Value Assets Measured On Recurring Basis Unobservable Input [Abstract]                
Fair Value Assumptions, Expected Volatility Rate     26.00%   27.00%