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Derivative Financial Instruments - Amounts Related to Derivative Instruments Not Designated as Hedges (Details) - Not designated as hedges - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gain (loss) recognized in income | $ 242 | $ (233) | $ 409 | $ (164)
Client-related and other risk management: | Interest rate contracts | Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gain (loss) recognized in income | 25 | 10 | 58 | 21
Client-related and other risk management: | Foreign exchange contracts | Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gain (loss) recognized in income | 55 | (164) | 121 | (213)
Client-related and other risk management: | Equity contracts | Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gain (loss) recognized in income | 212 | (38) | 250 | 15
Client-related and other risk management: | Credit contracts | Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gain (loss) recognized in income | (26) | (26) | (11) | (12)
Client-related and other risk management: | Commodity contracts | Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gain (loss) recognized in income | 2 | 3 | 6 | 6
MSRs and mortgage banking: | Interest rate contracts | Location, Statement of Income, Balance [Axis]: us-gaap:NoninterestIncome |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Pre-tax gain (loss) recognized in income | $ (26) | $ (18) | $ (15) | $ 19

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- Definition Line items represent financial concepts included in a table. 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