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Reserve for Future Policy Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, before Reinsurance $ 484 $ 502 $ 646 $ 723 $ 638
Life Conversions          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 49 47 58   52
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 113 112 152   167
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (11) (14) 19   26
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 124 126 133   141
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   7 5   11
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   133 138   152
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 20 17 19    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (29) (29) (38)    
Liability for Future Policy Benefit, before Reinsurance $ 64 $ 65 $ 94   94
Liability for Future Policy Benefit, Weighted-Average Duration 12 years 2 months 12 days 11 years 4 months 24 days 15 years 6 months    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance $ 204 $ 212 $ 225    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance $ 114 $ 120 $ 131    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.20% 4.10% 4.10%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.10% 5.30% 2.90%    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   $ 0 $ 0   0
Paid Up Life          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change $ 185 192 262   293
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (32) (39) 14   29
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 217 231 248   264
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (1) 0   (1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   230 248   263
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 8 7 7    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (21) (24) (22)    
Liability for Future Policy Benefit, before Reinsurance $ 185 $ 192 $ 262   267
Liability for Future Policy Benefit, Weighted-Average Duration 6 years 4 months 24 days 6 years 4 months 24 days 8 years 2 months 12 days    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance $ 281 $ 300 $ 324    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance $ 0 $ 0 $ 0    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 2.90% 2.90% 2.90%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.00% 5.20% 2.10%    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   $ 0 $ 0   0
Deferred Profit Liability          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, before Reinsurance $ 20 19 20   0
Fixed Annuity          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 137 140 188   206
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax 7 4 47   59
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 130 136 141   147
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   1 0   0
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   135 141   147
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 7 8 7    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (12) (13) (13)    
Liability for Future Policy Benefit, before Reinsurance $ 137 $ 140 $ 188   189
Liability for Future Policy Benefit, Weighted-Average Duration 9 years 9 years 2 months 12 days 9 years 2 months 12 days    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance $ 257 $ 272 $ 283    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance $ 0 $ 0 $ 0    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 5.60% 5.60% 5.60%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.00% 5.30% 2.80%    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   $ (2) $ 0   0
Long-Duration Insurance, Other          
Liability for Future Policy Benefit, Activity [Line Items]          
Liability for Future Policy Benefit, before Reinsurance $ 78 $ 86 $ 82   $ 88