Revenue and Interest Recognized in Income (Details) - Life policy reserves: - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 86	$ 83	$ 171	$ 164
Interest accretion	17	17	35	34
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	73	71	146	140
Interest accretion	12	11	24	23
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	13	12	25	24
Interest accretion	$ 5	$ 6	$ 11	$ 11