Revenue and Interest Recognized in Income (Details) - Life policy reserves: - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 85	$ 81	$ 256	$ 245
Interest accretion	18	17	53	51
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	71	70	217	210
Interest accretion	13	12	37	35
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	14	11	39	35
Interest accretion	$ 5	$ 5	$ 16	$ 16