Insurance and Contractholder Liabilities - Market Risk Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Insurance Loss Reserves [Abstract]
Annuitization election period	30 days
Market Risk Benefit [Roll Forward]
Balance, beginning of year	$ 785	$ 1,003
Balance, beginning of year, before the effect of nonperformance risk (own credit risk)	838	1,085
Changes due to expected run-off	(4)	(3)
Changes due to capital markets versus expected	44	(113)
Changes due to policyholder behavior versus expected	0	(14)
Balance, end of period, before the effect of changes in nonperformance risk (own credit risk)	878	955
Nonperformance risk (own credit risk), end of period	(48)	(64)
Balance, end of period	830	891
Reinsured market risk benefit, end of period	$ 876	$ 951