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Financial Derivatives (Derivative Assets and Liabilities Offsetting) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract] |  |
Gross Fair Value | $ 6,533 | $ 3,502
Fair Value Offset Amount | 720 | 690
Cash Collateral | 1,434 | 616
Net Fair Value | 4,379 | 2,196
Securities Collateral Held /Pledged Under Master Netting Agreements | 532 | 215
Net Amounts | 3,847 | 1,981
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract] |  |
Gross Fair Value | 2,756 | 2,019
Fair Value Offset Amount | 720 | 690
Cash Collateral | 1,452 | 790
Net Fair Value | 584 | 539
Securities Collateral Held /Pledged Under Master Netting Agreements |  |
Net Amounts | 584 | 539
Commodity contracts |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract] |  |
Gross Fair Value | 411 | 306
Fair Value Offset Amount | 209 | 198
Cash Collateral | 4 | 18
Net Fair Value | 198 | 90
Net Amounts | 198 | 90
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract] |  |
Gross Fair Value | 384 | 301
Fair Value Offset Amount | 182 | 152
Cash Collateral | 103 | 17
Net Fair Value | 99 | 132
Net Amounts | 99 | 132
Foreign exchange and other contracts |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract] |  |
Gross Fair Value | 271 | 213
Fair Value Offset Amount | 81 | 127
Cash Collateral | 4 | 5
Net Fair Value | 186 | 81
Securities Collateral Held /Pledged Under Master Netting Agreements | 1 |
Net Amounts | 185 | 81
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract] |  |
Gross Fair Value | 590 | 425
Fair Value Offset Amount | 76 | 63
Cash Collateral | 170 | 81
Net Fair Value | 344 | 281
Net Amounts | 344 | 281
Over-the-counter cleared | Interest rate contracts: |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract] |  |
Gross Fair Value | 48 | 14
Net Fair Value | 48 | 14
Net Amounts | 48 | 14
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract] |  |
Gross Fair Value | 42 | 14
Net Fair Value | 42 | 14
Net Amounts | 42 | 14
Over-the-counter | Interest rate contracts: |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract] |  |
Gross Fair Value | 5,803 | 2,969
Fair Value Offset Amount | 430 | 365
Cash Collateral | 1,426 | 593
Net Fair Value | 3,947 | 2,011
Securities Collateral Held /Pledged Under Master Netting Agreements | 531 | 215
Net Amounts | 3,416 | 1,796
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract] |  |
Gross Fair Value | 1,740 | 1,279
Fair Value Offset Amount | 462 | 475
Cash Collateral | 1,179 | 692
Net Fair Value | 99 | 112
Securities Collateral Held /Pledged Under Master Netting Agreements |  |
Net Amounts | $ 99 | $ 112

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