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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | $ 233,333 | $ 232,327
Derivative assets, gross amount | 3,716 | 3,415
Derivative liabilities, gross amount | 2,410 | 1,518
Derivative asset, netting adjustments | (964) | (1,148)
Derivative liability, netting adjustments | (850) | (739)
Total derivative assets | 2,752 | 2,267
Total derivative liabilities | 1,560 | 779
Net valuation allowance on derivative assets and liabilities for non-performance risk | 23 | 31
Derivatives designated as accounting hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 140,373 | 138,724
Derivative assets, gross amount | 604 | 921
Derivative liabilities, gross amount | 196 | 368
Derivatives designated as accounting hedges | Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 131,261 | 129,499
Derivative assets, gross amount | 486 | 757
Derivative liabilities, gross amount | 19 | 11
Derivatives designated as accounting hedges | Interest rate contracts | Fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 44,361 | 47,349
Derivative assets, gross amount | 5 | 9
Derivative liabilities, gross amount | 7 | 10
Derivatives designated as accounting hedges | Interest rate contracts | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 86,900 | 82,150
Derivative assets, gross amount | 481 | 748
Derivative liabilities, gross amount | 12 | 1
Derivatives designated as accounting hedges | Foreign exchange contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 9,112 | 9,225
Derivative assets, gross amount | 118 | 164
Derivative liabilities, gross amount | 177 | 357
Derivatives designated as accounting hedges | Foreign exchange contracts | Fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 1,482 | 1,527
Derivative assets, gross amount | 83 | 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 | 4,233 | 4,582
Derivative assets, gross amount | 35 | 0
Derivative liabilities, gross amount | 33 | 161
Derivatives designated as accounting hedges | Foreign exchange contracts | Net investment hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 3,397 | 3,116
Derivative assets, gross amount | 0 | 0
Derivative liabilities, gross amount | 144 | 196
Derivatives not designated as accounting hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 92,960 | 93,603
Derivative assets, gross amount | 3,112 | 2,494
Derivative liabilities, gross amount | 2,214 | 1,150
Derivatives not designated as accounting hedges | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 89,763 | 90,007
Derivative assets, gross amount | 3,067 | 2,422
Derivative liabilities, gross amount | 2,167 | 1,088
Derivatives not designated as accounting hedges | Interest rate contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 68,537 | 68,459
Derivative assets, gross amount | 935 | 1,429
Derivative liabilities, gross amount | 173 | 198
Derivatives not designated as accounting hedges | Interest rate contracts | Other interest rate exposures |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 1,209 | 1,770
Derivative assets, gross amount | 45 | 71
Derivative liabilities, gross amount | 46 | 56
Derivatives not designated as accounting hedges | Foreign exchange contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 4,450 | 4,677
Derivative assets, gross amount | 39 | 58
Derivative liabilities, gross amount | 31 | 70
Derivatives not designated as accounting hedges | Commodity contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 16,776 | 16,871
Derivative assets, gross amount | 2,093 | 935
Derivative liabilities, gross amount | 1,963 | 820
Derivatives not designated as accounting hedges | Other contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 1,988 | 1,826
Derivative assets, gross amount | 0 | 1
Derivative liabilities, gross amount | $ 1 | $ 6

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