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Financial Derivatives (Derivative Assets and Liabilities Offsetting) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Offsetting Derivative Assets [Abstract] |  |
Derivative asset, gross fair value | $ 7,035 | $ 6,533
Derivative Asset, Fair Value Offset Amount | 1,027 | 720
Derivative asset, cash collateral | 757 | 1,434
Derivative Asset, Net | 5,251 | 4,379
Derivative Asset, Securities Collateral Held Under Master Netting Agreements | 287 | 532
Derivative Asset, Fair Value, Amount Offset Against Collateral | 4,964 | 3,847
Offsetting Derivative Liabilities [Abstract] |  |
Derivative liability, gross fair value | 4,781 | 2,756
Derivative liability, fair value offset amount | 1,027 | 720
Derivative liability, cash collateral | 2,403 | 1,452
Derivative liability, net | 1,351 | 584
Derivative liability, fair value of collateral |  |
Derivative liability, fair value, amount offset against collateral | 1,351 | 584
Interest Rate Contracts | Over-the-counter cleared |  |
Offsetting Derivative Assets [Abstract] |  |
Derivative asset, gross fair value | 51 | 48
Derivative Asset, Net | 51 | 48
Derivative Asset, Fair Value, Amount Offset Against Collateral | 51 | 48
Offsetting Derivative Liabilities [Abstract] |  |
Derivative liability, gross fair value | 68 | 42
Derivative liability, net | 68 | 42
Derivative liability, fair value, amount offset against collateral | 68 | 42
Interest Rate Contracts | Over-the-counter |  |
Offsetting Derivative Assets [Abstract] |  |
Derivative asset, gross fair value | 4,219 | 5,803
Derivative Asset, Fair Value Offset Amount | 556 | 430
Derivative asset, cash collateral | 723 | 1,426
Derivative Asset, Net | 2,940 | 3,947
Derivative Asset, Securities Collateral Held Under Master Netting Agreements | 287 | 531
Derivative Asset, Fair Value, Amount Offset Against Collateral | 2,653 | 3,416
Offsetting Derivative Liabilities [Abstract] |  |
Derivative liability, gross fair value | 1,647 | 1,740
Derivative liability, fair value offset amount | 613 | 462
Derivative liability, cash collateral | 813 | 1,179
Derivative liability, net | 221 | 99
Derivative liability, fair value, amount offset against collateral | 221 | 99
Commodity contracts: |  |
Offsetting Derivative Assets [Abstract] |  |
Derivative asset, gross fair value | 2,521 | 411
Derivative Asset, Fair Value Offset Amount | 343 | 209
Derivative asset, cash collateral | 28 | 4
Derivative Asset, Net | 2,150 | 198
Derivative Asset, Fair Value, Amount Offset Against Collateral | 2,150 | 198
Offsetting Derivative Liabilities [Abstract] |  |
Derivative liability, gross fair value | 2,536 | 384
Derivative liability, fair value offset amount | 353 | 182
Derivative liability, cash collateral | 1,511 | 103
Derivative liability, net | 672 | 99
Derivative liability, fair value, amount offset against collateral | 672 | 99
Foreign exchange contracts and other |  |
Offsetting Derivative Assets [Abstract] |  |
Derivative asset, gross fair value | 244 | 271
Derivative Asset, Fair Value Offset Amount | 128 | 81
Derivative asset, cash collateral | 6 | 4
Derivative Asset, Net | 110 | 186
Derivative Asset, Securities Collateral Held Under Master Netting Agreements |  | 1
Derivative Asset, Fair Value, Amount Offset Against Collateral | 110 | 185
Offsetting Derivative Liabilities [Abstract] |  |
Derivative liability, gross fair value | 530 | 590
Derivative liability, fair value offset amount | 61 | 76
Derivative liability, cash collateral | 79 | 170
Derivative liability, net | 390 | 344
Derivative liability, fair value, amount offset against collateral | $ 390 | $ 344

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