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Investments (Allowance on available-for-sale securities with credit impairments and PCD assets activity) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Allowance for credit losses:    
Balance, beginning of period $ 18 $ 40
Additions to the allowance for credit losses:    
Securities for which credit losses were not previously recorded 0 14
Available-for-sale securities accounted for as PCD assets 3 11
Reductions to the allowance for credit losses:    
Securities sold during the period (realized) 0 24
Write-offs charged against the allowance 12 16
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period (8) (7)
Balance, end of period 1 18
Corporate and other bonds    
Allowance for credit losses:    
Balance, beginning of period 11 23
Additions to the allowance for credit losses:    
Securities for which credit losses were not previously recorded 0 14
Available-for-sale securities accounted for as PCD assets 0 5
Reductions to the allowance for credit losses:    
Securities sold during the period (realized) 0 7
Write-offs charged against the allowance 12 16
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period 1 (8)
Balance, end of period 0 11
Asset-backed    
Allowance for credit losses:    
Balance, beginning of period 7 17
Additions to the allowance for credit losses:    
Securities for which credit losses were not previously recorded 0 0
Available-for-sale securities accounted for as PCD assets 3 6
Reductions to the allowance for credit losses:    
Securities sold during the period (realized) 0 17
Write-offs charged against the allowance 0 0
Additional increases or (decreases) to the allowance for credit losses on securities that had an allowance recorded in a previous period (9) 1
Balance, end of period $ 1 $ 7