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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | $ 213,069 | $ 232,327
Derivative assets, gross amount | 2,690 | 3,415
Derivative liabilities, gross amount | 1,868 | 1,518
Derivative asset, netting adjustments | (542) | (1,148)
Derivative liability, netting adjustments | (544) | (739)
Total derivative assets | 2,148 | 2,267
Total derivative liabilities | 1,324 | 779
Net valuation allowance on derivative assets and liabilities for non-performance risk | 11 | 31
Derivatives designated as accounting hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 111,618 | 138,724
Derivative assets, gross amount | 326 | 921
Derivative liabilities, gross amount | 39 | 368
Derivatives designated as accounting hedges | Interest rate contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 102,059 | 129,499
Derivative assets, gross amount | 246 | 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 | 49,659 | 47,349
Derivative assets, gross amount | 2 | 9
Derivative liabilities, gross amount | 3 | 10
Derivatives designated as accounting hedges | Interest rate contracts | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 52,400 | 82,150
Derivative assets, gross amount | 244 | 748
Derivative liabilities, gross amount | 16 | 1
Derivatives designated as accounting hedges | Foreign exchange contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 9,559 | 9,225
Derivative assets, gross amount | 80 | 164
Derivative liabilities, gross amount | 20 | 357
Derivatives designated as accounting hedges | Foreign exchange contracts | Fair value hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 1,421 | 1,527
Derivative assets, gross amount | 13 | 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 | 4,679 | 4,582
Derivative assets, gross amount | 24 | 0
Derivative liabilities, gross amount | 20 | 161
Derivatives designated as accounting hedges | Foreign exchange contracts | Net investment hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 3,459 | 3,116
Derivative assets, gross amount | 43 | 0
Derivative liabilities, gross amount | 0 | 196
Derivatives not designated as accounting hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 101,451 | 93,603
Derivative assets, gross amount | 2,364 | 2,494
Derivative liabilities, gross amount | 1,829 | 1,150
Derivatives not designated as accounting hedges | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 97,524 | 90,007
Derivative assets, gross amount | 2,329 | 2,422
Derivative liabilities, gross amount | 1,797 | 1,088
Derivatives not designated as accounting hedges | Interest rate contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 71,724 | 68,459
Derivative assets, gross amount | 620 | 1,429
Derivative liabilities, gross amount | 194 | 198
Derivatives not designated as accounting hedges | Interest rate contracts | Other interest rate exposures |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 1,899 | 1,770
Derivative assets, gross amount | 33 | 71
Derivative liabilities, gross amount | 25 | 56
Derivatives not designated as accounting hedges | Foreign exchange contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 3,779 | 4,677
Derivative assets, gross amount | 40 | 58
Derivative liabilities, gross amount | 42 | 70
Derivatives not designated as accounting hedges | Commodity contracts | Customer accommodation |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 22,021 | 16,871
Derivative assets, gross amount | 1,669 | 935
Derivative liabilities, gross amount | 1,561 | 820
Derivatives not designated as accounting hedges | Other contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional or contractual amount | 2,028 | 1,826
Derivative assets, gross amount | 2 | 1
Derivative liabilities, gross amount | $ 7 | $ 6

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