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Financial Derivatives (Total Derivatives) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Derivative, Notional Amount | $ 443,379 | $ 394,447
Derivative Asset, Fair Value | 3,502 | 2,081
Derivative Liability, Fair Value | 2,019 | 2,290
Derivative Asset, Fair Value Offset Amount | 690 | 688
Derivative Asset, Cash Collateral | 616 | 341
Derivative Asset, Net Fair Value | 2,196 | 1,052
Derivative Liability, Fair Value Offset Amount | 690 | 688
Derivative Liability, Cash Collateral | 790 | 539
Derivative Liability, Net Fair Value | 539 | 1,063
Commodity Contracts |  |
Derivative [Line Items] |  |
Derivative Asset, Fair Value | 306 | 311
Derivative Liability, Fair Value | 301 | 305
Derivative Asset, Cash Collateral | 18 | 210
Derivative Liability, Cash Collateral | 17 | 17
Foreign Exchange And Other Contract |  |
Derivative [Line Items] |  |
Derivative Asset, Fair Value | 213 | 269
Derivative Liability, Fair Value | 425 | 465
Derivative Asset, Cash Collateral | 5 | 14
Derivative Liability, Cash Collateral | 81 | 33
Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 55,407 | 49,268
Derivative Asset, Fair Value | 6 | 8
Derivative Liability, Fair Value | 6 | 10
Designated as Hedging Instrument | Fair Value Hedging | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 30,663 | 30,919
Derivative Asset, Fair Value |  | 7
Derivative Liability, Fair Value |  |
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 23,642 | 17,337
Derivative Asset, Fair Value | 6 | 1
Derivative Liability, Fair Value |  |
Designated as Hedging Instrument | Net Investment Hedging | Foreign Exchange Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 1,102 | 1,012
Derivative Asset, Fair Value |  |
Derivative Liability, Fair Value | 6 | 10
Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 387,972 | 345,179
Derivative Asset, Fair Value | 3,496 | 2,073
Derivative Liability, Fair Value | 2,013 | 2,280
Not Designated as Hedging Instrument | Mortgage Banking | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 66,366 | 66,022
Derivative Asset, Fair Value | 93 | 57
Derivative Liability, Fair Value | 67 | 45
Not Designated as Hedging Instrument | Mortgage Banking | Swap | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 52,007 | 43,084
Derivative Asset, Fair Value | 1 |
Derivative Liability, Fair Value |  | 3
Not Designated as Hedging Instrument | Mortgage Banking | Future | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 3,487 | 10,658
Not Designated as Hedging Instrument | Mortgage Banking | Mortgage Commitment | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 7,738 | 5,771
Derivative Asset, Fair Value | 60 | 47
Derivative Liability, Fair Value | 44 | 39
Not Designated as Hedging Instrument | Mortgage Banking | Other Contract | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 3,134 | 6,509
Derivative Asset, Fair Value | 32 | 10
Derivative Liability, Fair Value | 23 | 3
Not Designated as Hedging Instrument | Customer Contracts |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 311,405 | 271,249
Derivative Asset, Fair Value | 3,394 | 1,941
Derivative Liability, Fair Value | 1,689 | 1,972
Not Designated as Hedging Instrument | Customer Contracts | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 274,878 | 241,765
Derivative Asset, Fair Value | 2,884 | 1,436
Derivative Liability, Fair Value | 1,226 | 1,475
Not Designated as Hedging Instrument | Customer Contracts | Commodity Contracts |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 9,407 | 6,231
Derivative Asset, Fair Value | 306 | 311
Derivative Liability, Fair Value | 301 | 305
Not Designated as Hedging Instrument | Customer Contracts | Foreign Exchange And Other Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 27,120 | 23,253
Derivative Asset, Fair Value | 204 | 194
Derivative Liability, Fair Value | 162 | 192
Not Designated as Hedging Instrument | Customer Contracts | Swap | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 249,075 | 218,496
Derivative Asset, Fair Value | 2,769 | 1,352
Derivative Liability, Fair Value | 1,187 | 1,432
Not Designated as Hedging Instrument | Customer Contracts | Swap | Commodity Contracts |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 5,204 | 4,813
Derivative Asset, Fair Value | 234 | 244
Derivative Liability, Fair Value | 229 | 238
Not Designated as Hedging Instrument | Customer Contracts | Future | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 703 | 914
Not Designated as Hedging Instrument | Customer Contracts | Mortgage Commitment | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 3,721 | 2,246
Derivative Asset, Fair Value | 2 | 7
Derivative Liability, Fair Value | 6 | 10
Not Designated as Hedging Instrument | Customer Contracts | Other Contract | Interest Rate Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 21,379 | 20,109
Derivative Asset, Fair Value | 113 | 77
Derivative Liability, Fair Value | 33 | 33
Not Designated as Hedging Instrument | Customer Contracts | Other Contract | Commodity Contracts |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 4,203 | 1,418
Derivative Asset, Fair Value | 72 | 67
Derivative Liability, Fair Value | 72 | 67
Not Designated as Hedging Instrument | Other Risk Management Activity | Foreign Exchange And Other Contract |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | 10,201 | 7,908
Derivative Asset, Fair Value | 9 | 75
Derivative Liability, Fair Value | $ 257 | $ 263

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