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Derivative Instruments and Hedging Activities - Notional and Fair Values of Derivative Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | $ 271,019 | $ 255,546
Derivative assets, gross amount | 6,617 | 1,729
Derivative liabilities, gross amount | 3,884 | 1,197
Derivative asset, netting adjustments | (3,567) | (633)
Derivative liability, netting adjustments | (1,127) | (523)
Total derivative assets | 3,050 | 1,096
Total derivative liabilities | 2,757 | 674
Net valuation allowance on derivative assets and liabilities for non-performance risk | 19 | 12
Derivatives designated as accounting hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 171,402 | 164,821
Derivative assets, gross amount | 1,392 | 332
Derivative liabilities, gross amount | 103 | 305
Derivatives designated as accounting hedges | Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 162,324 | 154,487
Derivative assets, gross amount | 1,013 | 332
Derivative liabilities, gross amount | 88 | 84
Derivatives designated as accounting hedges | Interest rate contracts | Fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 56,324 | 57,587
Derivative assets, gross amount | 9 | 11
Derivative liabilities, gross amount | 61 | 55
Derivatives designated as accounting hedges | Interest rate contracts | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 106,000 | 96,900
Derivative assets, gross amount | 1,004 | 321
Derivative liabilities, gross amount | 27 | 29
Derivatives designated as accounting hedges | Foreign exchange contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 9,078 | 10,334
Derivative assets, gross amount | 379 | 0
Derivative liabilities, gross amount | 15 | 221
Derivatives designated as accounting hedges | Foreign exchange contracts | Fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 1,379 | 1,402
Derivative assets, gross amount | 3 | 0
Derivative liabilities, gross amount | 11 | 6
Derivatives designated as accounting hedges | Foreign exchange contracts | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 5,193 | 6,103
Derivative assets, gross amount | 287 | 0
Derivative liabilities, gross amount | 4 | 113
Derivatives designated as accounting hedges | Foreign exchange contracts | Net investment hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 2,506 | 2,829
Derivative assets, gross amount | 89 | 0
Derivative liabilities, gross amount | 0 | 102
Derivatives not designated as accounting hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 99,617 | 90,725
Derivative assets, gross amount | 5,225 | 1,397
Derivative liabilities, gross amount | 3,781 | 892
Derivatives not designated as accounting hedges | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 90,594 | 82,434
Derivative assets, gross amount | 5,129 | 1,349
Derivative liabilities, gross amount | 3,718 | 853
Derivatives not designated as accounting hedges | Interest rate contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 67,383 | 62,268
Derivative assets, gross amount | 1,650 | 552
Derivative liabilities, gross amount | 293 | 117
Derivatives not designated as accounting hedges | Interest rate contracts | Other interest rate exposures |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 7,478 | 6,729
Derivative assets, gross amount | 91 | 48
Derivative liabilities, gross amount | 52 | 30
Derivatives not designated as accounting hedges | Foreign exchange contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 3,988 | 4,674
Derivative assets, gross amount | 76 | 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 | 19,223 | 15,492
Derivative assets, gross amount | 3,403 | 758
Derivative liabilities, gross amount | 3,355 | 694
Derivatives not designated as accounting hedges | Other contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 1,545 | 1,562
Derivative assets, gross amount | 5 | 0
Derivative liabilities, gross amount | $ 11 | $ 9

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