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Revenue and Interest Recognized in Income (Details) - Life policy reserves: - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 87	$ 87
Interest accretion	19	19
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	74	74
Interest accretion	13	13
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	13	13
Interest accretion	$ 6	$ 6

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