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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Loans | $ 4,523 | $ 2,504 | $ 8,781 | $ 4,797
Investment Securities | 883 | 631 | 1,768 | 1,175
Borrowed Funds | 903 | 142 | 1,686 | 225
Noninterest income | $ 1,783 | $ 2,065 | $ 3,801 | $ 3,953
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Investment Securities, Interest Expense | Investment Securities, Interest Expense | Investment Securities, Interest Expense | Investment Securities, Interest Expense
Other |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Noninterest income | $ 129 | $ 177 | $ 387 | $ 388
Fair value hedges | Designated as Hedging Instrument | Investment Securities |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives | 50 | 30 | 5 | 49
Fair value hedges | Designated as Hedging Instrument | Investment Securities | Interest Income |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Hedged items | (48) | (28) | (1) | (46)
Amounts related to interest settlements on derivatives | 7 | (2) | 12 | (3)
Fair value hedges | Designated as Hedging Instrument | Borrowed Funds |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivatives | (439) | (451) | (148) | (1,395)
Fair value hedges | Designated as Hedging Instrument | Borrowed Funds | Interest Expense |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Hedged items | 432 | 443 | 135 | 1,377
Amounts related to interest settlements on derivatives | (147) | 74 | (260) | 184
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 | (365) | 25 | (690) | 117
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 | $ (8) |  | $ (13) | 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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