Future Policy Benefits Reserves - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Insurance [Abstract]
Pretax change in LFPB	$ 8	$ 186
Liability for future policy benefit, expected future gross premium, discounted, before reinsurance	$ 3,700	$ 4,100	$ 3,700	$ 4,100
Liability for future policy benefit, weighted-average duration	12 years	12 years	12 years	12 years
Liability for future policy benefit, adverse development, expense	$ 109	$ 154	$ 152	$ 154
Liability future policy benefit, losses recognized in prior period	$ 26	$ 1	$ 37	$ 1