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Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Derivative [Line Items] |  |
Derivative, notional amount | $ 677,174 | $ 581,268
Derivative asset, fair value | 3,838 | 3,768
Derivative liability, fair value | 8,220 | 7,618
Derivative asset, fair value offset amount | 1,396 | 1,523
Derivative liability, fair value offset amount | 1,396 | 1,523
Derivative asset, cash collateral | 1,593 | 714
Derivative liability, cash collateral | 1,599 | 1,571
Derivative Asset, Net | 849 | 1,531
Derivative liability, net | 5,225 | 4,524
Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative asset, fair value | 548 | 1,208
Derivative liability, fair value | 577 | 1,269
Derivative asset, cash collateral | 71 | 2
Derivative liability, cash collateral | 31 | 520
Derivative Asset, Net | 227 | 871
Derivative liability, net | 87 | 70
Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative asset, fair value | 451 | 437
Derivative liability, fair value | 387 | 520
Derivative asset, cash collateral | 204 | 82
Derivative liability, cash collateral | 1 | 10
Derivative Asset, Net | 115 | 141
Derivative liability, net | 260 | 291
Mortgage Banking | Overlay Swap | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 400 |
Customer Contracts | Overlay Swap | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 22,600 |
Designated as Hedging Instruments under GAAP |  |
Derivative [Line Items] |  |
Derivative, notional amount | 90,932 | 65,661
Derivative asset, fair value | 244 | 24
Derivative liability, fair value | 283 | 1
Designated as Hedging Instruments under GAAP | Fair value hedges | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 29,523 | 24,231
Designated as Hedging Instruments under GAAP | Cash flow hedges | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 35,241 | 40,310
Derivative liability, fair value | 2 | 1
Designated as Hedging Instruments under GAAP | Cash flow hedges | Other | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 25,000 |
Derivative asset, fair value | 222 |
Derivative liability, fair value | 281 |
Designated as Hedging Instruments under GAAP | Net investment hedges | Foreign exchange contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,168 | 1,120
Derivative asset, fair value | 22 | 24
Derivative liability, fair value |  |
Not Designated as Hedging Instrument under GAAP |  |
Derivative [Line Items] |  |
Derivative, notional amount | 586,242 | 515,607
Derivative asset, fair value | 3,594 | 3,744
Derivative liability, fair value | 7,937 | 7,617
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 75,254 | 75,978
Derivative asset, fair value | 128 | 182
Derivative liability, fair value | 98 | 104
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Swaps | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 45,056 | 47,908
Derivative asset, fair value |  | 7
Derivative liability, fair value | 4 | 1
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Futures | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 8,860 | 5,537
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Mortgage-backed commitments | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 4,750 | 4,516
Derivative asset, fair value | 77 | 85
Derivative liability, fair value | 73 | 89
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Other | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 16,588 | 18,017
Derivative asset, fair value | 51 | 90
Derivative liability, fair value | 21 | 14
Not Designated as Hedging Instrument under GAAP | Customer Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 493,561 | 426,844
Derivative asset, fair value | 3,349 | 3,515
Derivative liability, fair value | 7,729 | 7,286
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 452,751 | 386,052
Derivative asset, fair value | 2,489 | 1,941
Derivative liability, fair value | 6,875 | 5,724
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 9,452 | 10,280
Derivative asset, fair value | 548 | 1,208
Derivative liability, fair value | 577 | 1,269
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative, notional amount | 31,358 | 30,512
Derivative asset, fair value | 312 | 366
Derivative liability, fair value | 277 | 293
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Swaps | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 420,301 | 354,150
Derivative asset, fair value | 2,170 | 1,597
Derivative liability, fair value | 6,579 | 5,397
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Swaps | Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 6,558 | 5,792
Derivative asset, fair value | 477 | 1,003
Derivative liability, fair value | 504 | 1,067
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Futures | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 41 | 32
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Mortgage-backed commitments | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 3,675 | 2,799
Derivative asset, fair value | 27 | 10
Derivative liability, fair value | 11 | 6
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Other | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 28,734 | 29,071
Derivative asset, fair value | 292 | 334
Derivative liability, fair value | 285 | 321
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Other | Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 2,894 | 4,488
Derivative asset, fair value | 71 | 205
Derivative liability, fair value | 73 | 202
Not Designated as Hedging Instrument under GAAP | Other Risk Management Activity | Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative, notional amount | 17,427 | 12,785
Derivative asset, fair value | 117 | 47
Derivative liability, fair value | $ 110 | $ 227

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