Revenue and Interest Recognized in Income (Details) - Life policy reserves: - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 85	$ 81
Interest accretion	18	17
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	73	69
Interest accretion	12	12
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	12	12
Interest accretion	$ 6	$ 5