Investments - Schedule of Net Investment Income by Asset Class (Details) - Retirement Services - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Net Investment Income [Line Items]
Investment revenue	$ 5,061	$ 4,126	$ 14,270	$ 11,550
Investment expenses	(48)	(25)	(140)	(69)
Net investment income	5,013	4,101	14,130	11,481
AFS securities
Net Investment Income [Line Items]
Investment revenue	3,022	2,519	8,563	6,996
Trading securities
Net Investment Income [Line Items]
Investment revenue	90	40	198	125
Equity securities
Net Investment Income [Line Items]
Investment revenue	18	19	62	65
Mortgage loans
Net Investment Income [Line Items]
Investment revenue	1,397	1,007	3,782	2,711
Investment funds
Net Investment Income [Line Items]
Investment revenue	35	45	200	35
Funds withheld at interest
Net Investment Income [Line Items]
Investment revenue	232	279	741	1,001
Other
Net Investment Income [Line Items]
Investment revenue	$ 267	$ 217	$ 724	$ 617

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 of expenses related to the generation of investment income.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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