Supplemental Cash Flow Information - Net change (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net change in proceeds managed
Net change in fixed income securities	$ 0	$ 0	$ 52
Net change in short-term investments	(539)	396	(417)
Operating cash flow (used) provided	(539)	396	(365)
Net change in cash	9	(12)	0
Net change in proceeds managed	(530)	384	(365)
Net change in liabilities
Liabilities for collateral, beginning of year	(914)	(1,298)	(933)
Liabilities for collateral, end of year	(1,444)	(914)	(1,298)
Operating cash flow provided (used)	$ 530	$ (384)	$ 365