Reserve for Future Policy Benefits and Contractholder Funds - Contractholder funds activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Contractholder funds activity
Balance, beginning of year	$ 908	$ 857	$ 915
Deposits	133	118	121
Interest credited	32	34	33
Benefits	(21)	(41)	(34)
Surrenders and partial withdrawals	(28)	(23)	(61)
Contract charges	(121)	(107)	(123)
Other adjustments	(6)	70	6
Balance, end of year	$ 897	$ 908	$ 857