Investments - Schedule of Net Investment Income by Asset Class (Details) - Retirement Services - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Net Investment Income [Line Items]
Investment revenue	$ 5,407	$ 4,832	$ 10,584	$ 9,209
Investment expenses	(57)	(56)	(95)	(92)
Net investment income	5,350	4,776	10,489	9,117
AFS securities
Net Investment Income [Line Items]
Investment revenue	3,114	2,877	6,152	5,541
Trading securities
Net Investment Income [Line Items]
Investment revenue	142	66	264	108
Equity securities
Net Investment Income [Line Items]
Investment revenue	12	29	28	44
Mortgage loans
Net Investment Income [Line Items]
Investment revenue	1,588	1,262	3,132	2,385
Investment funds
Net Investment Income [Line Items]
Investment revenue	18	127	12	165
Funds withheld at interest
Net Investment Income [Line Items]
Investment revenue	222	244	437	509
Other
Net Investment Income [Line Items]
Investment revenue	$ 311	$ 227	$ 559	$ 457

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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