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Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Derivative, notional amount | $ 513,110 | $ 466,707
Derivative asset, fair value | 6,447 | 6,533
Derivative liability, fair value | 3,719 | 2,756
Derivative asset, fair value offset amount | 919 | 720
Derivative liability, fair value offset amount | 919 | 720
Derivative asset, cash collateral | 859 | 1,434
Derivative liability, cash collateral | 2,078 | 1,452
Derivative asset, net fair value | 4,669 | 4,379
Derivative liability, net fair value | 722 | 584
Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative asset, fair value | 1,469 | 411
Derivative liability, fair value | 1,485 | 384
Derivative asset, cash collateral | 15 | 4
Derivative liability, cash collateral | 997 | 103
Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative asset, fair value | 254 | 271
Derivative liability, fair value | 457 | 590
Derivative asset, cash collateral | 14 | 4
Derivative liability, cash collateral | 132 | 170
Designated as Hedging Instruments under GAAP |  |
Derivative [Line Items] |  |
Derivative, notional amount | 61,798 | 48,103
Derivative asset, fair value | 20 | 14
Derivative liability, fair value | 46 | 22
Designated as Hedging Instruments under GAAP | Fair value hedges | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 25,293 | 24,153
Designated as Hedging Instruments under GAAP | Cash flow hedges | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 35,405 | 22,875
Derivative asset, fair value | 20 | 14
Derivative liability, fair value | 13 |
Designated as Hedging Instruments under GAAP | Net investment hedges | Foreign exchange contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 1,100 | 1,075
Derivative asset, fair value |  |
Derivative liability, fair value | 33 | 22
Not Designated as Hedging Instrument under GAAP |  |
Derivative [Line Items] |  |
Derivative, notional amount | 451,312 | 418,604
Derivative asset, fair value | 6,427 | 6,519
Derivative liability, fair value | 3,673 | 2,734
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 61,340 | 66,471
Derivative asset, fair value | 151 | 158
Derivative liability, fair value | 83 | 79
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Swaps | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 32,917 | 50,511
Derivative asset, fair value |  |
Derivative liability, fair value | 1 |
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Futures | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 3,930 | 2,841
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Mortgage-backed commitments | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 11,609 | 11,288
Derivative asset, fair value | 104 | 147
Derivative liability, fair value | 58 | 77
Not Designated as Hedging Instrument under GAAP | Mortgage Banking | Other | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 12,884 | 1,831
Derivative asset, fair value | 47 | 11
Derivative liability, fair value | 24 | 2
Not Designated as Hedging Instrument under GAAP | Customer Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 376,333 | 341,202
Derivative asset, fair value | 6,220 | 6,357
Derivative liability, fair value | 3,360 | 2,330
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 336,995 | 305,663
Derivative asset, fair value | 4,553 | 5,679
Derivative liability, fair value | 1,681 | 1,703
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 11,970 | 8,919
Derivative asset, fair value | 1,469 | 411
Derivative liability, fair value | 1,485 | 384
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative, notional amount | 27,368 | 26,620
Derivative asset, fair value | 198 | 267
Derivative liability, fair value | 194 | 243
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Swaps | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 309,609 | 280,125
Derivative asset, fair value | 4,395 | 5,475
Derivative liability, fair value | 1,570 | 1,601
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Swaps | Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 8,535 | 6,149
Derivative asset, fair value | 1,207 | 350
Derivative liability, fair value | 1,223 | 323
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Futures | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 981 | 1,235
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Mortgage-backed commitments | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 4,236 | 4,178
Derivative asset, fair value | 10 | 11
Derivative liability, fair value | 8 | 14
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Other | Interest Rate Contracts |  |
Derivative [Line Items] |  |
Derivative, notional amount | 22,169 | 20,125
Derivative asset, fair value | 148 | 193
Derivative liability, fair value | 103 | 88
Not Designated as Hedging Instrument under GAAP | Customer Contracts | Other | Commodity contracts: |  |
Derivative [Line Items] |  |
Derivative, notional amount | 3,435 | 2,770
Derivative asset, fair value | 262 | 61
Derivative liability, fair value | 262 | 61
Not Designated as Hedging Instrument under GAAP | Other Risk Management Activity | Foreign exchange contracts and other |  |
Derivative [Line Items] |  |
Derivative, notional amount | 13,639 | 10,931
Derivative asset, fair value | 56 | 4
Derivative liability, fair value | $ 230 | $ 325

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