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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | $ 232,327 | $ 255,546
Derivative assets, gross amount | 3,415 | 1,729
Derivative liabilities, gross amount | 1,518 | 1,197
Derivative asset, netting adjustments | (1,148) | (633)
Derivative liability, netting adjustments | (739) | (523)
Total derivative assets | 2,267 | 1,096
Total derivative liabilities | 779 | 674
Net valuation allowance on derivative assets and liabilities for non-performance risk | 31 | 12
Derivatives designated as accounting hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 138,724 | 164,821
Derivative assets, gross amount | 921 | 332
Derivative liabilities, gross amount | 368 | 305
Derivatives designated as accounting hedges | Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 129,499 | 154,487
Derivative assets, gross amount | 757 | 332
Derivative liabilities, gross amount | 11 | 84
Derivatives designated as accounting hedges | Interest rate contracts | Fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 47,349 | 57,587
Derivative assets, gross amount | 9 | 11
Derivative liabilities, gross amount | 10 | 55
Derivatives designated as accounting hedges | Interest rate contracts | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 82,150 | 96,900
Derivative assets, gross amount | 748 | 321
Derivative liabilities, gross amount | 1 | 29
Derivatives designated as accounting hedges | Foreign exchange contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 9,225 | 10,334
Derivative assets, gross amount | 164 | 0
Derivative liabilities, gross amount | 357 | 221
Derivatives designated as accounting hedges | Foreign exchange contracts | Fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 1,527 | 1,402
Derivative assets, gross amount | 164 | 0
Derivative liabilities, gross amount | 0 | 6
Derivatives designated as accounting hedges | Foreign exchange contracts | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 4,582 | 6,103
Derivative assets, gross amount | 0 | 0
Derivative liabilities, gross amount | 161 | 113
Derivatives designated as accounting hedges | Foreign exchange contracts | Net investment hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 3,116 | 2,829
Derivative assets, gross amount | 0 | 0
Derivative liabilities, gross amount | 196 | 102
Derivatives not designated as accounting hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 93,603 | 90,725
Derivative assets, gross amount | 2,494 | 1,397
Derivative liabilities, gross amount | 1,150 | 892
Derivatives not designated as accounting hedges | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 90,007 | 82,434
Derivative assets, gross amount | 2,422 | 1,349
Derivative liabilities, gross amount | 1,088 | 853
Derivatives not designated as accounting hedges | Interest rate contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 68,459 | 62,268
Derivative assets, gross amount | 1,429 | 552
Derivative liabilities, gross amount | 198 | 117
Derivatives not designated as accounting hedges | Interest rate contracts | Other interest rate exposures |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 1,770 | 6,729
Derivative assets, gross amount | 71 | 48
Derivative liabilities, gross amount | 56 | 30
Derivatives not designated as accounting hedges | Foreign exchange contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 4,677 | 4,674
Derivative assets, gross amount | 58 | 39
Derivative liabilities, gross amount | 70 | 42
Derivatives not designated as accounting hedges | Commodity contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 16,871 | 15,492
Derivative assets, gross amount | 935 | 758
Derivative liabilities, gross amount | 820 | 694
Derivatives not designated as accounting hedges | Other contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 1,826 | 1,562
Derivative assets, gross amount | 1 | 0
Derivative liabilities, gross amount | $ 6 | $ 9

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