Supplemental Cash Flow Information - Activities resulting from management of proceeds (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Net change in proceeds managed
Net change in fixed income securities	$ (373)	$ 0
Net change in short-term investments	(203)	(583)
Operating cash flow (used)	(576)	(583)
Net change in cash	(12)	2
Net change in proceeds managed	(588)	(581)
Change in Liabilities for Collateral [Roll Forward]
Liabilities for collateral, beginning of period	(1,444)	(914)
Liabilities for collateral, end of period	(2,032)	(1,495)
Operating cash flow provided	$ 588	$ 581