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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount $ 314,074 $ 294,039
Derivative assets, gross amount 2,408 2,675
Derivative liabilities, gross amount 2,657 2,932
Derivative Asset, netting adjustments (725) (1,005)
Derivative Liability, netting adjustments (622) (597)
Net Amounts as Recognized 1,683 1,670
Net Amounts as Recognized 2,035 2,335
Net valuation allowance on derivative assets and liabilities for non-performance risk 3 2
Derivatives designated as accounting hedges:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 165,636 148,075
Derivative assets, gross amount 317 235
Derivative liabilities, gross amount 461 317
Derivatives designated as accounting hedges: | Interest rate contracts:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 157,334 139,337
Derivative assets, gross amount 315 234
Derivative liabilities, gross amount 162 49
Derivatives designated as accounting hedges: | Interest rate contracts: | Fair value hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 64,284 68,987
Derivative assets, gross amount 8 18
Derivative liabilities, gross amount 82 26
Derivatives designated as accounting hedges: | Interest rate contracts: | Cash flow hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 93,050 70,350
Derivative assets, gross amount 307 216
Derivative liabilities, gross amount 80 23
Derivatives designated as accounting hedges: | Foreign exchange and other contracts    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 8,302 8,738
Derivative assets, gross amount 2 1
Derivative liabilities, gross amount 299 268
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Fair value hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 557 1,380
Derivative assets, gross amount 0 0
Derivative liabilities, gross amount 66 113
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Cash flow hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 2,645 2,488
Derivative assets, gross amount 0 0
Derivative liabilities, gross amount 59 66
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Net investment hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 5,100 4,870
Derivative assets, gross amount 2 1
Derivative liabilities, gross amount 174 89
Derivatives not designated as accounting hedges:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 148,438 145,964
Derivative assets, gross amount 2,091 2,440
Derivative liabilities, gross amount 2,196 2,615
Derivatives not designated as accounting hedges: | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 144,506 142,137
Derivative assets, gross amount 2,052 2,399
Derivative liabilities, gross amount 2,150 2,576
Derivatives not designated as accounting hedges: | Interest rate contracts: | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 103,279 103,489
Derivative assets, gross amount 844 1,188
Derivative liabilities, gross amount 929 1,382
Derivatives not designated as accounting hedges: | Interest rate contracts: | Other interest rate exposures    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 921 872
Derivative assets, gross amount 19 21
Derivative liabilities, gross amount 14 31
Derivatives not designated as accounting hedges: | Foreign exchange and other contracts | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 5,580 5,153
Derivative assets, gross amount 31 50
Derivative liabilities, gross amount 39 47
Derivatives not designated as accounting hedges: | Commodity contracts | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 35,647 33,495
Derivative assets, gross amount 1,177 1,161
Derivative liabilities, gross amount 1,182 1,147
Derivatives not designated as accounting hedges: | Other contracts    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 3,011 2,955
Derivative assets, gross amount 20 20
Derivative liabilities, gross amount $ 32 $ 8