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Investments (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
tranche
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
tranche
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Gain (Loss) on Securities [Line Items]          
Mortgage loan losses due to changes in expected credit losses $ 0 $ 5 $ 0 $ 11  
Commitments to purchase or fund privately placed debt securities 1,645   1,645    
Commitments to sell various privately placed debt securities 90   90    
Fixed maturity securities 42,579   42,579   $ 40,425
Net investment income 626 553 1,853 1,653  
Affiliated Entity          
Gain (Loss) on Securities [Line Items]          
Fixed maturity securities 52   52    
Affiliated Entity | Maximum          
Gain (Loss) on Securities [Line Items]          
Net investment income 1        
Mortgage loans          
Gain (Loss) on Securities [Line Items]          
Financing receivable, accrued interest, after allowance for credit loss 4   4    
Fixed maturity securities          
Gain (Loss) on Securities [Line Items]          
Debt securities, available-for-sale, accrued interest, after allowance for credit loss 451 $ 430 451 $ 430 $ 435
Commercial mortgage-backed          
Gain (Loss) on Securities [Line Items]          
Amount of securitization 305   $ 305    
Commercial mortgage-backed | Affiliated Entity          
Gain (Loss) on Securities [Line Items]          
Related party transaction, amounts of transaction $ 50        
Number of tranches | tranche 3   3