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Financial Derivatives (Gains (Losses) Recognized on Fair Value and Cash Flow Hedges in the Consolidated Income Statement) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Loans | $ 4,954 | $ 4,643 | $ 14,615 | $ 13,424
Investment Securities | 1,097 | 892 | 2,981 | 2,660
Borrowed Funds | 1,182 | 993 | 3,523 | 2,679
Total other income | 69 | 94 | 536 | 481
Other amounts related to interest settlements on derivatives | 5 | 32 | 47 | 87
Loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income |  | (418) |  | (1,108)
Investment Securities |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income |  | (8) |  | (21)
Interest Income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Hedged items | 529 | (156) | 637 | (157)
Interest Income | Loans |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income | (304) |  | (1,020) |
Interest Income | Investment Securities |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income | (9) |  | (24) |
Interest Expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Hedged items | (1,089) | 416 | (654) | 551
Noninterest Income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income |  |  | (28) |
Fair value hedges | Designated as Hedging Instrument | Interest Income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives | (521) | 158 | (632) | 163
Amounts related to interest settlements on derivatives | 46 | 8 | 85 | 20
Fair value hedges | Designated as Hedging Instrument | Interest Expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives | 1,079 | (421) | 632 | (569)
Amounts related to interest settlements on derivatives | $ (195) | $ (167) | $ (560) | $ (427)

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