Supplemental Cash Flow Information - Schedule of Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net change in proceeds managed
Net change in fixed income securities	$ 259	$ (521)	$ 0
Net change in short-term investments	(139)	(49)	(539)
Operating cash flow provided (used)	120	(570)	(539)
Net change in cash	0	3	9
Net change in proceeds managed	120	(567)	(530)
Net change in liabilities
Liabilities for collateral, beginning of year	(2,011)	(1,444)	(914)
Liabilities for collateral, end of year	(1,891)	(2,011)	(1,444)
Operating cash flow (used) provided	$ (120)	$ 567	$ 530