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Revenue and Interest Recognized in Income (Details) - Life Policy Reserves - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Liability for Future Policy Benefit, Activity
Gross premiums	$ 351	$ 341	$ 327
Interest accretion	73	71	68
Term Life Insurance
Liability for Future Policy Benefit, Activity
Gross premiums	297	289	280
Interest accretion	51	49	47
Whole Life Insurance
Liability for Future Policy Benefit, Activity
Gross premiums	54	52	47
Interest accretion	$ 22	$ 22	$ 21

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