Revenue and Interest Recognized in Income (Details) - Life Policy Reserves - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Liability for Future Policy Benefit, Activity
Gross premiums	$ 341	$ 327	$ 317
Interest accretion	71	68	68
Term Life Insurance
Liability for Future Policy Benefit, Activity
Gross premiums	289	280	270
Interest accretion	49	47	47
Whole Life Insurance
Liability for Future Policy Benefit, Activity
Gross premiums	52	47	47
Interest accretion	$ 22	$ 21	$ 21