Revenue and Interest Recognized in Income (Details) - Life policy reserves: - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 87	$ 85
Interest accretion	19	18
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	74	73
Interest accretion	13	12
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	13	12
Interest accretion	$ 6	$ 6