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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
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |
Loans | $ 4,258 | $ 2,293
Investment Securities | 885 | 544
Borrowed Funds | 783 | 83
Noninterest income | $ 2,018 | $ 1,888
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Investment Securities, Interest Expense | Investment Securities, Interest Expense
Other |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Noninterest income | $ 258 | $ 211
Fair value hedges | Designated as Hedging Instrument | Investment Securities |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivatives | (45) | 19
Fair value hedges | Designated as Hedging Instrument | Investment Securities | Interest Income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Hedged items | 47 | (18)
Amounts related to interest settlements on derivatives | 5 | (1)
Fair value hedges | Designated as Hedging Instrument | Borrowed Funds |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivatives | 291 | (944)
Fair value hedges | Designated as Hedging Instrument | Borrowed Funds | Interest Expense |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Hedged items | (297) | 934
Amounts related to interest settlements on derivatives | (113) | 110
Cash flow hedges | Designated as Hedging Instrument | Loans | Interest Income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income | (325) | 92
Cash flow hedges | Designated as Hedging Instrument | Investment Securities | Interest Income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income | $ (5) | 10
Cash flow hedges | Designated as Hedging Instrument | Other | Noninterest Income |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of derivative gains (losses) reclassified from accumulated other comprehensive income |  |

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