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Future Contract Benefit - Summary of Gross Premiums and Interest Accretion (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Payout Annuities
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 108	$ 116	$ 133
Interest accretion	87	86	84
Traditional Life
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	1,251	1,252	1,211
Interest accretion	$ 148	$ 143	$ 134

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