Investments (Rollforward of the Allowance for Credit Losses for Fixed Maturity Securities by Sector) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Debt Securities, Available-for-sale [Line Items]
Balance, beginning of period	$ 21	$ 6
Allowance on securities where credit losses were not previously recorded	35	18
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 (1)	0	(1)
Balance, end of period	59	22
U.S. corporate
Debt Securities, Available-for-sale [Line Items]
Balance, beginning of period	15	1
Allowance on securities where credit losses were not previously recorded	13	14
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
Balance, end of period	31	15
Foreign corporate
Debt Securities, Available-for-sale [Line Items]
Balance, beginning of period	0	1
Allowance on securities where credit losses were not previously recorded	21	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)	0	(1)
Balance, end of period	21	0
RMBS
Debt Securities, Available-for-sale [Line Items]
Balance, beginning of period	4	1
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	0	0
Write-offs charged against allowance (1)	0	0
Balance, end of period	4	5
CMBS
Debt Securities, Available-for-sale [Line Items]
Balance, beginning of period	2	3
Allowance on securities where credit losses were not previously recorded	1	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 (1)	0	0
Balance, end of period	$ 3	$ 2