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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