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Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Derivative [Line Items] |  |
Derivative, notional amount | $ 716,509 | $ 656,051
Derivative asset, fair value | 3,308 | 3,429
Derivative liability, fair value | 4,627 | 5,899
Derivative asset, fair value offset amount | 1,431 | 1,406
Derivative liability, fair value offset amount | 1,431 | 1,406
Less: Cash collateral received/paid, derivative asset fair value | 761 | 1,126
Less: Cash collateral received/paid, derivative liability fair value | 836 | 955
Derivative assets, Net Fair Value | 1,116 | 897
Derivative liabilities, Net Fair Value | 2,360 | 3,538
Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative asset, fair value | 622 | 765
Derivative liability, fair value | 598 | 757
Less: Cash collateral received/paid, derivative asset fair value | 137 | 283
Less: Cash collateral received/paid, derivative liability fair value | 8 |
Derivative assets, Net Fair Value | 115 | 166
Derivative liabilities, Net Fair Value | 245 | 425
Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative asset, fair value | 336 | 307
Derivative liability, fair value | 668 | 494
Less: Cash collateral received/paid, derivative asset fair value | 25 | 76
Less: Cash collateral received/paid, derivative liability fair value | 43 | 13
Derivative assets, Net Fair Value | 194 | 117
Derivative liabilities, Net Fair Value | 410 | 292
Designated as Hedging Instruments under GAAP |  |
Derivative [Line Items] |  |
Derivative, notional amount | 129,143 | 91,555
Derivative asset, fair value | 350 | 327
Derivative liability, fair value | 150 | 139
Designated as Hedging Instruments under GAAP | Fair value hedges | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 54,084 | 32,079
Designated as Hedging Instruments under GAAP | Cash flow hedges | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 48,847 | 33,302
Derivative asset, fair value |  |
Derivative liability, fair value |  |
Designated as Hedging Instruments under GAAP | Cash flow hedges | Other | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 25,000 | 25,000
Derivative asset, fair value | 349 | 327
Derivative liability, fair value | 88 | 137
Designated as Hedging Instruments under GAAP | Net investment hedges | Foreign Exchange Contract |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,212 | 1,174
Derivative asset, fair value | 1 |
Derivative liability, fair value | 62 | 2
Not Designated as Hedging Instrument under GAAP |  |
Derivative [Line Items] |  |
Derivative, notional amount | 587,366 | 564,496
Derivative asset, fair value | 2,958 | 3,102
Derivative liability, fair value | 4,477 | 5,760
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 75,143 | 72,457
Derivative asset, fair value | 106 | 112
Derivative liability, fair value | 70 | 89
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Swaps | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 49,343 | 43,450
Derivative asset, fair value |  |
Derivative liability, fair value |  |
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Futures | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 9,863 | 10,370
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Mortgage-backed commitments | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 4,879 | 3,093
Derivative asset, fair value | 67 | 66
Derivative liability, fair value | 60 | 67
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Other | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 11,058 | 15,544
Derivative asset, fair value | 39 | 46
Derivative liability, fair value | 10 | 22
Not Designated as Hedging Instrument under GAAP | Customer Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 500,655 | 477,157
Derivative asset, fair value | 2,832 | 2,978
Derivative liability, fair value | 4,058 | 5,418
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 446,622 | 432,761
Derivative asset, fair value | 1,895 | 1,918
Derivative liability, fair value | 3,203 | 4,422
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 15,661 | 11,511
Derivative asset, fair value | 622 | 765
Derivative liability, fair value | 598 | 757
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative, notional amount | 38,372 | 32,885
Derivative asset, fair value | 315 | 295
Derivative liability, fair value | 257 | 239
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Swaps | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 409,026 | 401,607
Derivative asset, fair value | 1,769 | 1,723
Derivative liability, fair value | 3,094 | 4,228
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Swaps | Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 6,308 | 6,714
Derivative asset, fair value | 383 | 577
Derivative liability, fair value | 360 | 569
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Futures | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 133 | 73
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Mortgage-backed commitments | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 6,543 | 2,592
Derivative asset, fair value | 8 | 9
Derivative liability, fair value | 9 | 25
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Other | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 30,920 | 28,489
Derivative asset, fair value | 118 | 186
Derivative liability, fair value | 100 | 169
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Other | Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 9,353 | 4,797
Derivative asset, fair value | 239 | 188
Derivative liability, fair value | 238 | 188
Not Designated as Hedging Instrument under GAAP | Other Risk Management Activity | Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative, notional amount | 11,568 | 14,882
Derivative asset, fair value | 20 | 12
Derivative liability, fair value | $ 349 | $ 253

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