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Investments - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]          
Accrued interest receivables on available-for-sale fixed maturity securities $ 451 $ 430 $ 451 $ 430 $ 435
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Beginning balance 17 22 16 1  
Securities for which credit losses were not previously recorded 4 5 4 13  
Available-for-sale securities accounted for as PCD assets 2 2 2 22  
Securities sold during the period (realized)     4 6  
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis     1 3  
Write-offs charged against the allowance 9 15 9 15  
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 4 4 10 6  
Ending balance 18 18 18 18  
Corporate bonds and other          
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Beginning balance 0 13 4 0  
Securities for which credit losses were not previously recorded 4 5 4 6  
Available-for-sale securities accounted for as PCD assets 2 2 2 22  
Securities sold during the period (realized)     3 6  
Intent to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis     1 3  
Write-offs charged against the allowance 15 15  
Additional increases to the allowance for credit losses on securities that had an allowance recorded in a previous period 1  
Ending balance 6 5 6 5  
Asset-backed          
Debt Securities, Available-for-Sale, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Beginning balance 17 9 12 1  
Securities for which credit losses were not previously recorded 7  
Available-for-sale securities accounted for as PCD assets  
Securities sold 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 4 10 5  
Ending balance $ 12 $ 13 $ 12 $ 13