Investments - Net Investment Income (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 2,331	$ 2,099	$ 1,696
Investment expenses	(54)	(63)	(46)
Net investment income (excluding net realized capital gains or losses)	2,277	2,036	1,650
Less: Net realized capital gains (losses)	(44)	117	(497)
Net investment income	2,233	2,153	1,153
Debt securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	1,332	1,136	841
Mortgage loans
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	86	76	59
Other investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 913	$ 887	$ 796

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