Future Contract Benefit - Summary of Gross Premiums and Interest Accretion (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 24	$ 44	$ 45	$ 72
Interest accretion	22	22	43	43
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	316	314	631	627
Interest accretion	$ 37	$ 36	$ 74	$ 71