v3.26.1
Investments (Rollforward of the Allowance for Credit Losses for Fixed Maturity Securities by Sector) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, allowance for credit losses, beginning of period $ 62 $ 79
Allowance on securities where credit losses were not previously recorded 11 0
Reductions for securities sold (16) (2)
Change in allowance on securities with an allowance recorded in a previous period 7 4
Write-offs charged against allowance 0 (27)
Fixed maturity securities, allowance for credit losses, end of period 64 54
U.S. corporate    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, allowance for credit losses, beginning of period 27 47
Allowance on securities where credit losses were not previously recorded 1 0
Reductions for securities sold (2) (1)
Change in allowance on securities with an allowance recorded in a previous period 7 2
Write-offs charged against allowance 0 (27)
Fixed maturity securities, allowance for credit losses, end of period 33 21
Foreign corporate    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, allowance for credit losses, beginning of period 31 26
Allowance on securities where credit losses were not previously recorded 0 0
Reductions for securities sold (14) 0
Change in allowance on securities with an allowance recorded in a previous period 0 3
Write-offs charged against allowance 0 0
Fixed maturity securities, allowance for credit losses, end of period 17 29
RMBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, allowance for credit losses, beginning of period 3 4
Allowance on securities where credit losses were not previously recorded 0 0
Reductions for securities sold 0 0
Change in allowance on securities with an allowance recorded in a previous period 0 (1)
Write-offs charged against allowance 0 0
Fixed maturity securities, allowance for credit losses, end of period 3 3
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, allowance for credit losses, beginning of period 1 2
Allowance on securities where credit losses were not previously recorded 0 0
Reductions for securities sold 0 (1)
Change in allowance on securities with an allowance recorded in a previous period 0 0
Write-offs charged against allowance 0 0
Fixed maturity securities, allowance for credit losses, end of period 1 1
ABS    
Debt Securities, Available-for-sale [Line Items]    
Fixed maturity securities, allowance for credit losses, beginning of period 0 0
Allowance on securities where credit losses were not previously recorded 10 0
Reductions for securities sold 0 0
Change in allowance on securities with an allowance recorded in a previous period 0 0
Write-offs charged against allowance 0 0
Fixed maturity securities, allowance for credit losses, end of period $ 10 $ 0