Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Gain resulting from observable price changes	$ 0	$ 4
Positive adjustments, cumulative amount	23
Private equity, impairment	0	0
Private equity, cumulative impairment	15
Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value changes included in earnings for residential mortgage for which the fair value option was elected	(23)	$ (2)
Credit risk of fair value option	$ 0		$ 0

Amount of impairment loss on investment in equity security without readily determinable fair value.

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Amount of cumulative impairment loss on investment in equity security without readily determinable fair value.

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Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value.

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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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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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This item represents the estimated amount of gains or losses included in earnings during the period attributable to changes in instrument-specific credit risk arising from loans and other receivables held as assets.

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