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Reserve for Future Policy Benefits (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Liability for Future Policy Benefit, before Reinsurance $ 464 $ 489 $ 484  
Life Conversions        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance 45 44 49 $ 47
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 105 109 113 112
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (14) (15) (11) (14)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 119 124 124 126
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     2 3
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     126 129
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 9 9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (16) (14)    
Liability for Future Policy Benefit, before Reinsurance $ 60 $ 65    
Liability for Future Policy Benefit, Weighted-Average Duration 11 years 6 months 12 years 2 months 12 days    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance $ 199 $ 208    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance $ 109 $ 117    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.20% 4.20%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.50% 5.20%    
Paid Up Life        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change $ 172 $ 186 185 192
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (36) (38) (32) (39)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 208 224 217 231
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     0 (1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     217 230
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 3 3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (12) (9)    
Liability for Future Policy Benefit, before Reinsurance $ 172 $ 186    
Liability for Future Policy Benefit, Weighted-Average Duration 6 years 3 months 18 days 6 years 3 months 18 days    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance $ 268 $ 290    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance $ 0 $ 0    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 2.90% 2.90%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.40% 5.30%    
Deferred Profit Liability        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Liability for Future Policy Benefit, before Reinsurance $ 20 $ 19    
Fixed Annuity        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 129 139 137 140
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax 1 4 7 4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 128 135 130 136
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     1 1
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     $ 131 $ 137
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 3 4    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (6) (6)    
Liability for Future Policy Benefit, before Reinsurance $ 129 $ 139    
Liability for Future Policy Benefit, Weighted-Average Duration 9 years 9 years 1 month 6 days    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance $ 252 $ 267    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance $ 0 $ 0    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 5.60% 5.60%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.50% 5.20%    
Long-Duration Insurance, Other        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Liability for Future Policy Benefit, before Reinsurance $ 83 $ 80    
Group Benefits        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Prior accident year development [1] (339) (265)    
Group Benefits | Disability Insurance Policy [Member]        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Prior accident year development [1] $ 282 $ 236