Supplemental Cash Flow Information - Activities resulting from management of proceeds (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Net change in proceeds managed
Net change in fixed income securities	$ (473)	$ 0
Net change in short-term investments	(285)	(579)
Operating cash flow (used)	(758)	(579)
Net change in cash	1	12
Net change in proceeds managed	(757)	(567)
Change in Liabilities for Collateral [Roll Forward]
Liabilities for collateral, beginning of period	(1,444)	(914)
Liabilities for collateral, end of period	(2,201)	(1,481)
Operating cash flow provided	$ 757	$ 567