Investments (Rollforward of the Allowance for Credit Losses for Fixed Maturity Securities by Sector) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, allowance for credit losses, beginning of period	$ 79	$ 21
Allowance on securities where credit losses were not previously recorded	0	4
Reductions for securities sold	(2)	0
Change in allowance on securities with an allowance recorded in a previous period	4	0
Write-offs charged against allowance (1)	(27)	0
Fixed maturity securities, allowance for credit losses, end of period	54	25
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, allowance for credit losses, beginning of period	47	15
Allowance on securities where credit losses were not previously recorded	0	0
Reductions for securities sold	(1)	0
Change in allowance on securities with an allowance recorded in a previous period	2	(1)
Write-offs charged against allowance (1)	(27)	0
Fixed maturity securities, allowance for credit losses, end of period	21	14
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, allowance for credit losses, beginning of period	26	0
Allowance on securities where credit losses were not previously recorded	0	4
Reductions for securities sold	0	0
Change in allowance on securities with an allowance recorded in a previous period	3	0
Write-offs charged against allowance (1)	0	0
Fixed maturity securities, allowance for credit losses, end of period	29	4
RMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, allowance for credit losses, beginning of period	4	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	(1)	1
Write-offs charged against allowance (1)	0	0
Fixed maturity securities, allowance for credit losses, end of period	3	5
CMBS
Debt Securities, Available-for-sale [Line Items]
Fixed maturity securities, allowance for credit losses, beginning of period	2	2
Allowance on securities where credit losses were not previously recorded	0	0
Reductions for securities sold	(1)	0
Change in allowance on securities with an allowance recorded in a previous period	0	0
Write-offs charged against allowance (1)	0	0
Fixed maturity securities, allowance for credit losses, end of period	$ 1	$ 2