Investments - Schedule of Net Investment Income by Asset Class (Details) - Retirement Services - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Net Investment Income [Line Items]
Investment revenue	$ 19,442	$ 15,817	$ 12,171
Investment expenses	(197)	(99)	(91)
Net investment income	19,245	15,718	12,080
AFS securities
Net Investment Income [Line Items]
Investment revenue	11,626	9,691	6,901
Trading securities
Net Investment Income [Line Items]
Investment revenue	324	161	177
Equity securities
Net Investment Income [Line Items]
Investment revenue	78	90	76
Mortgage loans
Net Investment Income [Line Items]
Investment revenue	5,218	3,767	2,360
Investment funds
Net Investment Income [Line Items]
Investment revenue	234	(38)	90
Funds withheld at interest
Net Investment Income [Line Items]
Investment revenue	964	1,318	1,752
Other
Net Investment Income [Line Items]
Investment revenue	$ 998	$ 828	$ 815

Amount, before investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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