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Undiscounted and Discounted Future Benefit Payments and Gross Premiums (Details) - Life Policy Reserves - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Term Life Insurance
Liability for Future Policy Benefit, Activity
Undiscounted expected future benefit payments	$ 4,883	$ 4,791
Undiscounted expected future gross premiums	4,556	4,374
Discounted expected future benefit payments	2,668	2,751	$ 2,584	$ 2,993
Discounted expected future gross premiums	2,625	2,652
Whole Life Insurance
Liability for Future Policy Benefit, Activity
Undiscounted expected future benefit payments	1,718	1,648
Undiscounted expected future gross premiums	694	659
Discounted expected future benefit payments	623	657	$ 614	$ 826
Discounted expected future gross premiums	$ 412	$ 409

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