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Investment Information - Net investment Income (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net investment income:
Gross investment income		$ 1,717	$ 1,586	$ 1,100
Investment expenses		(92)	(91)	(77)
Net investment income		1,625	1,495	1,023
Fixed maturities
Net investment income:
Gross investment income		1,465	1,266	917
Short-term investments
Net investment income:
Gross investment income		102	144	68
Equity securities
Net investment income:
Gross investment income		41	40	22
Other
Net investment income:
Gross investment income	[1]	$ 109	$ 136	$ 93
[1] Amounts include dividends and other distributions on investment funds, term loan investments, funds held balances, cash balances and other items.

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