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Reinsurance - Life Insurance Ceded Business (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Reinsurance for Insurance Companies, by Product Segment
Earned premiums	$ 2,567	$ 2,297	$ 7,391	$ 6,524
Insurance losses and contract holders' benefits	1,540	1,578	5,168	4,407
Life Insurance Segment
Reinsurance for Insurance Companies, by Product Segment
Direct earned premiums	104	101	307	301
Ceded earned premiums	(21)	(21)	(61)	(61)
Earned premiums	83	80	246	240
Direct contract holders' benefits incurred	91	92	289	262
Ceded contract holders' benefits incurred	(15)	(13)	(59)	(36)
Insurance losses and contract holders' benefits	$ 76	$ 79	$ 230	$ 226

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