Supplemental Cash Flow Information - Schedule of Activities Resulting from Management of Proceeds (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Net change in proceeds managed
Net change in fixed income securities	$ 207	$ (473)
Net change in short-term investments	58	(285)
Operating cash flow provided (used)	265	(758)
Net change in cash	0	1
Net change in proceeds managed	265	(757)
Change in Liabilities for Collateral [Roll Forward]
Liabilities for collateral, beginning of period	(2,011)	(1,444)
Liabilities for collateral, end of period	(1,746)	(2,201)
Operating cash flow (used) provided	$ (265)	$ 757