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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | $ 231,927 | $ 232,327
Derivative assets, gross amount | 2,869 | 3,415
Derivative liabilities, gross amount | 1,651 | 1,518
Derivative asset, netting adjustments | (844) | (1,148)
Derivative liability, netting adjustments | (679) | (739)
Total derivative assets | 2,025 | 2,267
Total derivative liabilities | 972 | 779
Net valuation allowance on derivative assets and liabilities for non-performance risk | 26 | 31
Derivatives designated as accounting hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 138,774 | 138,724
Derivative assets, gross amount | 599 | 921
Derivative liabilities, gross amount | 328 | 368
Derivatives designated as accounting hedges | Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 130,030 | 129,499
Derivative assets, gross amount | 509 | 757
Derivative liabilities, gross amount | 52 | 11
Derivatives designated as accounting hedges | Interest rate contracts | Fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 45,880 | 47,349
Derivative assets, gross amount | 6 | 9
Derivative liabilities, gross amount | 22 | 10
Derivatives designated as accounting hedges | Interest rate contracts | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 84,150 | 82,150
Derivative assets, gross amount | 503 | 748
Derivative liabilities, gross amount | 30 | 1
Derivatives designated as accounting hedges | Foreign exchange contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 8,744 | 9,225
Derivative assets, gross amount | 90 | 164
Derivative liabilities, gross amount | 276 | 357
Derivatives designated as accounting hedges | Foreign exchange contracts | Fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 1,466 | 1,527
Derivative assets, gross amount | 84 | 164
Derivative liabilities, gross amount | 0 | 0
Derivatives designated as accounting hedges | Foreign exchange contracts | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 4,106 | 4,582
Derivative assets, gross amount | 6 | 0
Derivative liabilities, gross amount | 81 | 161
Derivatives designated as accounting hedges | Foreign exchange contracts | Net investment hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 3,172 | 3,116
Derivative assets, gross amount | 0 | 0
Derivative liabilities, gross amount | 195 | 196
Derivatives not designated as accounting hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 93,153 | 93,603
Derivative assets, gross amount | 2,270 | 2,494
Derivative liabilities, gross amount | 1,323 | 1,150
Derivatives not designated as accounting hedges | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 89,241 | 90,007
Derivative assets, gross amount | 2,211 | 2,422
Derivative liabilities, gross amount | 1,287 | 1,088
Derivatives not designated as accounting hedges | Interest rate contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 68,333 | 68,459
Derivative assets, gross amount | 935 | 1,429
Derivative liabilities, gross amount | 210 | 198
Derivatives not designated as accounting hedges | Interest rate contracts | Other interest rate exposures |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 2,118 | 1,770
Derivative assets, gross amount | 59 | 71
Derivative liabilities, gross amount | 33 | 56
Derivatives not designated as accounting hedges | Foreign exchange contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 4,027 | 4,677
Derivative assets, gross amount | 42 | 58
Derivative liabilities, gross amount | 38 | 70
Derivatives not designated as accounting hedges | Commodity contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 16,881 | 16,871
Derivative assets, gross amount | 1,234 | 935
Derivative liabilities, gross amount | 1,039 | 820
Derivatives not designated as accounting hedges | Other contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 1,794 | 1,826
Derivative assets, gross amount | 0 | 1
Derivative liabilities, gross amount | $ 3 | $ 6

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