Fair Value - Schedule of Gain (Losses) Recorded for Financial Instruments Elected the Fair Value Option (Details) - Retirement Services - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures [Line Items]
Total gains (losses)	$ 3,019	$ (348)	$ 199
Trading securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Total gains (losses)	372	(156)	66
Mortgage loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Total gains (losses)	2,427	(237)	183
Investment funds
Fair Value, Option, Quantitative Disclosures [Line Items]
Total gains (losses)	174	(59)	77
Future policy benefits
Fair Value, Option, Quantitative Disclosures [Line Items]
Total gains (losses)	17	76	(14)
Other
Fair Value, Option, Quantitative Disclosures [Line Items]
Total gains (losses)	$ 29	$ 28	$ (113)

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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