Investments (Rollforward of the Allowance for Credit Losses for Fixed Maturity Securities by Sector) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	$ 21	$ 6
Allowance on securities where credit losses were not previously recorded	56	18
Reductions for securities sold	0	(1)
Change in allowance on securities with an allowance recorded in a previous period	2	(1)
Write-offs charged against allowance	0	(1)
Fixed maturity securities, allowance for credit losses, end of year	79	21
U.S. corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	15	1
Allowance on securities where credit losses were not previously recorded	29	15
Reductions for securities sold	0	(1)
Change in allowance on securities with an allowance recorded in a previous period	3	0
Write-offs charged against allowance	0	0
Fixed maturity securities, allowance for credit losses, end of year	47	15
RMBS
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	4	1
Allowance on securities where credit losses were not previously recorded	1	3
Reductions for securities sold	0	0
Change in allowance on securities with an allowance recorded in a previous period	(1)	0
Write-offs charged against allowance	0	0
Fixed maturity securities, allowance for credit losses, end of year	4	4
CMBS
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	2	3
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 year	2	2
Foreign corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	0	1
Allowance on securities where credit losses were not previously recorded	26	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	(1)
Fixed maturity securities, allowance for credit losses, end of year	$ 26	$ 0