Investments (Rollforward of the Allowance for Credit Losses for Fixed Maturity Securities by Sector (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	$ 2
Allowance on securities where credit losses were not previously recorded	11	$ 4
Reductions for securities sold	(2)	(1)
Change in allowance on securities with an allowance recorded in a previous period	0	(1)
Write-offs charged against allowance	0	(4)
Fixed maturity securities, allowance for credit losses, end of year	11	2
U.S. corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	2
Allowance on securities where credit losses were not previously recorded	2	3
Reductions for securities sold	(2)	(1)
Change in allowance on securities with an allowance recorded in a previous period	0	0
Write-offs charged against allowance	0	(3)
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
Allowance on securities where credit losses were not previously recorded	7	1
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	(1)
Fixed maturity securities, allowance for credit losses, end of year	7	0
CMBS
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year	0
Allowance on securities where credit losses were not previously recorded	2
Reductions for securities sold	0	0
Change in allowance on securities with an allowance recorded in a previous period	0
Write-offs charged against allowance	0	0
Fixed maturity securities, allowance for credit losses, end of year	$ 2	0
Cumulative Effect, Adjusted Balance
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year		4
Cumulative Effect, Adjusted Balance | U.S. corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year		3
Cumulative Effect, Adjusted Balance | Foreign corporate
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year		1
Cumulative Effect, Adjusted Balance | CMBS
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Fixed maturity securities, allowance for credit losses, beginning of year		$ 0