v3.26.3
Reserve for Future Policy Benefits (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Liability for Future Policy Benefit, before Reinsurance $ 421 $ 456 $ 444  
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 110 126 123 $ 128
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (7) 4 3 0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 117 122 120 128
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 (1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     122 127
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 0 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 4 4    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (9) (9)    
Liability for Future Policy Benefit, before Reinsurance $ 110 $ 126    
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 9 months 18 days 9 years 4 months 24 days    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance $ 230 $ 240    
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 6.30% 5.20%    
Life Conversions        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 39 $ 43 43 45
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change 94 105 104 106
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (19) (13) (15) (15)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 113 118 119 121
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 3
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     120 124
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 11 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 9 15    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (27) (21)    
Liability for Future Policy Benefit, before Reinsurance $ 55 $ 62    
Liability for Future Policy Benefit, Weighted-Average Duration 9 years 6 months 11 years    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance $ 179 $ 189    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance $ 94 $ 100    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.30% 4.30%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 6.30% 5.40%    
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 $ 159 $ 167 165 168
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (32) (24) (24) (33)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance 191 191 189 201
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0 1
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     $ 189 $ 203
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 11 0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 6 4    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (15) (16)    
Liability for Future Policy Benefit, before Reinsurance $ 159 $ 167    
Liability for Future Policy Benefit, Weighted-Average Duration 5 years 4 months 24 days 6 years 2 months 12 days    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance $ 241 $ 244    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance $ 0 $ 0    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 3.00% 2.90%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.90% 4.80%    
Deferred Profit Liability        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Liability for Future Policy Benefit, before Reinsurance $ 16 $ 16    
Long-Duration Insurance, Other        
Liabilities for Guarantees on Long-Duration Contracts [Line Items]        
Liability for Future Policy Benefit, before Reinsurance $ 81 $ 85