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Reinsurance - Life Insurance Ceded Business (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Reinsurance for Insurance Companies, by Product Segment
Insurance losses and contract holders' benefits	$ 1,578	$ 1,332	$ 4,407	$ 4,070
Life Insurance Segment
Reinsurance for Insurance Companies, by Product Segment
Direct earned premiums	101	97	301	293
Ceded earned premiums	(21)	(21)	(61)	(60)
Earned premiums	80	76	240	233
Direct contract holders' benefits incurred	92	92	262	289
Ceded contract holders' benefits incurred	(13)	(21)	(36)	(59)
Insurance losses and contract holders' benefits	$ 79	$ 71	$ 226	$ 230

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