Supplemental Cash Flow Information - Schedule of Activities Resulting from Management of Proceeds (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net change in proceeds managed
Net change in fixed income securities	$ (31)	$ 111
Net change in short-term investments	(127)	93
Operating cash flow (used) provided	(158)	204
Net change in liabilities
Liabilities for collateral, beginning of period	(1,891)	(2,011)
Liabilities for collateral, end of period	(2,049)	(1,807)
Operating cash flow provided (used)	$ 158	$ (204)