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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount $ 367,924 $ 325,778
Derivative assets, gross amount 2,125 2,232
Derivative liabilities, gross amount 1,971 2,032
Derivative Asset, netting adjustments (481) (1,056)
Derivative Liability, netting adjustments (449) (304)
Net Amounts as Recognized 1,644 1,176
Net Amounts as Recognized 1,522 1,728
Net valuation allowance on derivative assets and liabilities for non-performance risk 6 1
Derivatives designated as accounting hedges:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 188,430 171,725
Derivative assets, gross amount 220 390
Derivative liabilities, gross amount 112 138
Derivatives designated as accounting hedges: | Interest rate contracts:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 179,774 163,800
Derivative assets, gross amount 165 126
Derivative liabilities, gross amount 10 37
Derivatives designated as accounting hedges: | Interest rate contracts: | Fair value hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 62,024 61,250
Derivative assets, gross amount 12 3
Derivative liabilities, gross amount 2 13
Derivatives designated as accounting hedges: | Interest rate contracts: | Cash flow hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 117,750 102,550
Derivative assets, gross amount 153 123
Derivative liabilities, gross amount 8 24
Derivatives designated as accounting hedges: | Foreign exchange and other contracts    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 8,656 7,925
Derivative assets, gross amount 55 264
Derivative liabilities, gross amount 102 101
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Fair value hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 587 518
Derivative assets, gross amount 0 0
Derivative liabilities, gross amount 26 101
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Cash flow hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 2,654 2,549
Derivative assets, gross amount 21 74
Derivative liabilities, gross amount 1 0
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Net investment hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 5,415 4,858
Derivative assets, gross amount 34 190
Derivative liabilities, gross amount 75 0
Derivatives not designated as accounting hedges:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 179,494 154,053
Derivative assets, gross amount 1,905 1,842
Derivative liabilities, gross amount 1,859 1,894
Derivatives not designated as accounting hedges: | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 173,897 149,890
Derivative assets, gross amount 1,853 1,803
Derivative liabilities, gross amount 1,836 1,880
Derivatives not designated as accounting hedges: | Interest rate contracts: | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 125,615 108,754
Derivative assets, gross amount 723 865
Derivative liabilities, gross amount 747 1,014
Derivatives not designated as accounting hedges: | Interest rate contracts: | Other interest rate exposures    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 2,198 909
Derivative assets, gross amount 17 14
Derivative liabilities, gross amount 10 9
Derivatives not designated as accounting hedges: | Foreign exchange and other contracts | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 6,131 6,951
Derivative assets, gross amount 73 80
Derivative liabilities, gross amount 65 52
Derivatives not designated as accounting hedges: | Commodity contracts | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 42,151 34,185
Derivative assets, gross amount 1,057 858
Derivative liabilities, gross amount 1,024 814
Derivatives not designated as accounting hedges: | Other contracts    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 3,399 3,254
Derivative assets, gross amount 35 25
Derivative liabilities, gross amount $ 13 $ 5