Investments - Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net Investment Income [Line Items]
Investment income	$ 2,231	$ 2,088	$ 1,867
Investment expenses	(37)	(37)	(42)
Net investment income	2,194	2,051	1,825
Fixed maturity securities
Net Investment Income [Line Items]
Investment income	1,437	1,539	1,387
Equity securities
Net Investment Income [Line Items]
Investment income	42	40	18
Cash equivalents
Net Investment Income [Line Items]
Investment income	270	235	305
Other invested assets
Net Investment Income [Line Items]
Investment income	$ 482	$ 274	$ 157