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Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Derivative, notional amount | $ 522,114 | $ 466,707
Derivative asset, fair value | 7,035 | 6,533
Derivative liability, fair value | 4,781 | 2,756
Derivative asset, fair value offset amount | 1,027 | 720
Derivative liability, fair value offset amount | 1,027 | 720
Derivative asset, cash collateral | 757 | 1,434
Derivative liability, cash collateral | 2,403 | 1,452
Derivative asset, net fair value | 5,251 | 4,379
Derivative liability, net fair value | 1,351 | 584
Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative asset, fair value | 2,521 | 411
Derivative liability, fair value | 2,536 | 384
Derivative asset, cash collateral | 28 | 4
Derivative liability, cash collateral | 1,511 | 103
Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative asset, fair value | 244 | 271
Derivative liability, fair value | 530 | 590
Derivative asset, cash collateral | 6 | 4
Derivative liability, cash collateral | 79 | 170
Designated as Hedging Instruments under GAAP |  |
Derivative [Line Items] |  |
Derivative, notional amount | 68,003 | 48,103
Derivative asset, fair value | 13 | 14
Derivative liability, fair value | 41 | 22
Designated as Hedging Instruments under GAAP | Fair value hedges | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 24,837 | 24,153
Designated as Hedging Instruments under GAAP | Cash flow hedges | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 42,018 | 22,875
Derivative asset, fair value | 12 | 14
Derivative liability, fair value | 38 |
Designated as Hedging Instruments under GAAP | Net investment hedges | Foreign exchange contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,148 | 1,075
Derivative asset, fair value | 1 |
Derivative liability, fair value | 3 | 22
Not Designated as Hedging Instrument under GAAP |  |
Derivative [Line Items] |  |
Derivative, notional amount | 454,111 | 418,604
Derivative asset, fair value | 7,022 | 6,519
Derivative liability, fair value | 4,740 | 2,734
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 65,094 | 66,471
Derivative asset, fair value | 136 | 158
Derivative liability, fair value | 65 | 79
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Swaps | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 33,994 | 50,511
Derivative asset, fair value |  |
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Futures | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 3,666 | 2,841
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Mortgage-backed commitments | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 13,702 | 11,288
Derivative asset, fair value | 98 | 147
Derivative liability, fair value | 54 | 77
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Other | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 13,732 | 1,831
Derivative asset, fair value | 38 | 11
Derivative liability, fair value | 11 | 2
Not Designated as Hedging Instrument under GAAP | Customer Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 376,235 | 341,202
Derivative asset, fair value | 6,835 | 6,357
Derivative liability, fair value | 4,330 | 2,330
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 335,755 | 305,663
Derivative asset, fair value | 4,122 | 5,679
Derivative liability, fair value | 1,612 | 1,703
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 12,485 | 8,919
Derivative asset, fair value | 2,521 | 411
Derivative liability, fair value | 2,536 | 384
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative, notional amount | 27,995 | 26,620
Derivative asset, fair value | 192 | 267
Derivative liability, fair value | 182 | 243
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Swaps | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 304,724 | 280,125
Derivative asset, fair value | 3,961 | 5,475
Derivative liability, fair value | 1,508 | 1,601
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Swaps | Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 9,249 | 6,149
Derivative asset, fair value | 2,099 | 350
Derivative liability, fair value | 2,114 | 323
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Futures | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,006 | 1,235
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Mortgage-backed commitments | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 4,692 | 4,178
Derivative asset, fair value | 18 | 11
Derivative liability, fair value | 16 | 14
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Other | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 25,333 | 20,125
Derivative asset, fair value | 143 | 193
Derivative liability, fair value | 88 | 88
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Other | Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 3,236 | 2,770
Derivative asset, fair value | 422 | 61
Derivative liability, fair value | 422 | 61
Not Designated as Hedging Instrument under GAAP | Other Risk Management Activity | Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative, notional amount | 12,782 | 10,931
Derivative asset, fair value | 51 | 4
Derivative liability, fair value | $ 345 | $ 325

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