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Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 466,707 | $ 443,379
Derivative Asset, Fair Value | 6,533 | 3,502
Derivative Asset, Fair Value Offset Amount | 720 | 690
Derivative Asset, Cash Collateral | 1,434 | 616
Derivative Asset, Net Fair Value | 4,379 | 2,196
Derivative Liability, Fair Value | 2,756 | 2,019
Derivative Liability, Fair Value Offset Amount | 720 | 690
Derivative Liability, Cash Collateral | 1,452 | 790
Derivative Liability, Net Fair Value | 584 | 539
Commodity Contracts |  |
Derivative [Line Items] |  |
Derivative Asset, Fair Value | 411 | 306
Derivative Asset, Cash Collateral | 4 | 18
Derivative Liability, Fair Value | 384 | 301
Derivative Liability, Cash Collateral | 103 | 17
Foreign Exchange And Other Contract |  |
Derivative [Line Items] |  |
Derivative Asset, Fair Value | 271 | 213
Derivative Asset, Cash Collateral | 4 | 5
Derivative Liability, Fair Value | 590 | 425
Derivative Liability, Cash Collateral | 170 | 81
Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 48,103 | 55,407
Derivative Asset, Fair Value | 14 | 6
Derivative Liability, Fair Value | 22 | 6
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 24,153 | 30,663
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 22,875 | 23,642
Derivative Asset, Fair Value | 14 | 6
Derivative Liability, Fair Value |  |
Designated as Hedging Instrument | Net Investment Hedging | Foreign Exchange Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 1,075 | 1,102
Derivative Asset, Fair Value |  |
Derivative Liability, Fair Value | 22 | 6
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 418,604 | 387,972
Derivative Asset, Fair Value | 6,519 | 3,496
Derivative Liability, Fair Value | 2,734 | 2,013
Not Designated as Hedging Instrument | Mortgage Banking | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 66,471 | 66,366
Derivative Asset, Fair Value | 158 | 93
Derivative Liability, Fair Value | 79 | 67
Not Designated as Hedging Instrument | Mortgage Banking | Swap | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 50,511 | 52,007
Derivative Asset, Fair Value |  | 1
Derivative Liability, Fair Value |  |
Not Designated as Hedging Instrument | Mortgage Banking | Future | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 2,841 | 3,487
Not Designated as Hedging Instrument | Mortgage Banking | Mortgage-backed commitments | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 11,288 | 7,738
Derivative Asset, Fair Value | 147 | 60
Derivative Liability, Fair Value | 77 | 44
Not Designated as Hedging Instrument | Mortgage Banking | Other Contract | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 1,831 | 3,134
Derivative Asset, Fair Value | 11 | 32
Derivative Liability, Fair Value | 2 | 23
Not Designated as Hedging Instrument | Customer-related Contracts |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 341,202 | 311,405
Derivative Asset, Fair Value | 6,357 | 3,394
Derivative Liability, Fair Value | 2,330 | 1,689
Not Designated as Hedging Instrument | Customer-related Contracts | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 305,663 | 274,878
Derivative Asset, Fair Value | 5,679 | 2,884
Derivative Liability, Fair Value | 1,703 | 1,226
Not Designated as Hedging Instrument | Customer-related Contracts | Commodity Contracts |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 8,919 | 9,407
Derivative Asset, Fair Value | 411 | 306
Derivative Liability, Fair Value | 384 | 301
Not Designated as Hedging Instrument | Customer-related Contracts | Foreign Exchange And Other Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 26,620 | 27,120
Derivative Asset, Fair Value | 267 | 204
Derivative Liability, Fair Value | 243 | 162
Not Designated as Hedging Instrument | Customer-related Contracts | Swap | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 280,125 | 249,075
Derivative Asset, Fair Value | 5,475 | 2,769
Derivative Liability, Fair Value | 1,601 | 1,187
Not Designated as Hedging Instrument | Customer-related Contracts | Swap | Commodity Contracts |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 6,149 | 5,204
Derivative Asset, Fair Value | 350 | 234
Derivative Liability, Fair Value | 323 | 229
Not Designated as Hedging Instrument | Customer-related Contracts | Future | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 1,235 | 703
Not Designated as Hedging Instrument | Customer-related Contracts | Mortgage-backed commitments | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 4,178 | 3,721
Derivative Asset, Fair Value | 11 | 2
Derivative Liability, Fair Value | 14 | 6
Not Designated as Hedging Instrument | Customer-related Contracts | Other Contract | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 20,125 | 21,379
Derivative Asset, Fair Value | 193 | 113
Derivative Liability, Fair Value | 88 | 33
Not Designated as Hedging Instrument | Customer-related Contracts | Other Contract | Commodity Contracts |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 2,770 | 4,203
Derivative Asset, Fair Value | 61 | 72
Derivative Liability, Fair Value | 61 | 72
Not Designated as Hedging Instrument | Other Risk Management Activity | Foreign Exchange And Other Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 10,931 | 10,201
Derivative Asset, Fair Value | 4 | 9
Derivative Liability, Fair Value | $ 325 | $ 257

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