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Investments - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]          
Accrued interest receivables on available-for-sale fixed maturity securities $ 469 $ 451 $ 469 $ 451 $ 442
Allowance for credit losses:          
Beginning balance 51 17 45 16  
Securities for which credit losses were not previously recorded 3 4 6 4  
Available-for-sale securities accounted for as PCD assets 4 2 4 2  
Securities disposed during the period (realized)     6 4  
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis       1  
Write-offs charged against the allowance   9   9  
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 3 4 12 10  
Ending balance 61 18 61 18  
Corporate bonds and other          
Allowance for credit losses:          
Beginning balance 14 0 13 4  
Securities for which credit losses were not previously recorded 4 3 4  
Available-for-sale securities accounted for as PCD assets 4 2 4 2  
Securities disposed during the period (realized)     6 3  
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis       1  
Write-offs charged against the allowance      
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 3 7  
Ending balance 21 6 21 6  
Asset-backed          
Allowance for credit losses:          
Beginning balance 37 17 32 12  
Securities for which credit losses were not previously recorded 3 3  
Available-for-sale securities accounted for as PCD assets  
Securities disposed during the period (realized)     1  
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis        
Write-offs charged against the allowance   9   9  
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 4 5 10  
Ending balance $ 40 $ 12 $ 40 $ 12