Investments (Rollforward of the Allowance for Credit Losses for Fixed Maturity Securities by Sector (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	$ 6	$ 11
Allowance on securities where credit losses were not previously recorded	18	1
Reductions for securities sold	(1)	(1)
Change in allowance on securities with an allowance recorded in a previous period	(1)	1
Write-offs charged against allowance	(1)	(6)
Fixed maturity securities, allowance for credit losses, end of year	21	6
U.S. corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	1	2
Allowance on securities where credit losses were not previously recorded	15	0
Reductions for securities sold	(1)	(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 year	15	1
RMBS
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	1	0
Allowance on securities where credit losses were not previously recorded	3	1
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 year	4	1
CMBS
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	3	2
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	0	0
Fixed maturity securities, allowance for credit losses, end of year	2	3
Foreign corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	1	7
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	0
Write-offs charged against allowance	(1)	(6)
Fixed maturity securities, allowance for credit losses, end of year	$ 0	$ 1