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Revenue and Interest Recognized in Income (Details) - Life policy reserves: - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	$ 87	$ 85	$ 262	$ 256
Interest accretion	18	18	55	53
Term Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	72	71	221	217
Interest accretion	12	13	38	37
Whole Life Insurance
Liability for Future Policy Benefit, Activity [Line Items]
Gross premiums	15	14	41	39
Interest accretion	$ 6	$ 5	$ 17	$ 16

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