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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount $ 385,710 $ 325,778
Derivative assets, gross amount 2,201 2,232
Derivative liabilities, gross amount 2,129 2,032
Derivative Asset, netting adjustments (408) (1,056)
Derivative Liability, netting adjustments (501) (304)
Net Amounts as Recognized 1,793 1,176
Net Amounts as Recognized 1,628 1,728
Net valuation allowance on derivative assets and liabilities for non-performance risk 5 1
Derivatives designated as accounting hedges:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 200,680 171,725
Derivative assets, gross amount 176 390
Derivative liabilities, gross amount 277 138
Derivatives designated as accounting hedges: | Interest rate contracts:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 191,830 163,800
Derivative assets, gross amount 158 126
Derivative liabilities, gross amount 138 37
Derivatives designated as accounting hedges: | Interest rate contracts: | Fair value hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 60,580 61,250
Derivative assets, gross amount 13 3
Derivative liabilities, gross amount 52 13
Derivatives designated as accounting hedges: | Interest rate contracts: | Cash flow hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 131,250 102,550
Derivative assets, gross amount 145 123
Derivative liabilities, gross amount 86 24
Derivatives designated as accounting hedges: | Foreign exchange and other contracts    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 8,850 7,925
Derivative assets, gross amount 18 264
Derivative liabilities, gross amount 139 101
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 22 101
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Cash flow hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 2,737 2,549
Derivative assets, gross amount 0 74
Derivative liabilities, gross amount 35 0
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Net investment hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 5,526 4,858
Derivative assets, gross amount 18 190
Derivative liabilities, gross amount 82 0
Derivatives not designated as accounting hedges:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 185,030 154,053
Derivative assets, gross amount 2,025 1,842
Derivative liabilities, gross amount 1,852 1,894
Derivatives not designated as accounting hedges: | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 179,654 149,890
Derivative assets, gross amount 1,960 1,803
Derivative liabilities, gross amount 1,830 1,880
Derivatives not designated as accounting hedges: | Interest rate contracts: | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 132,966 108,754
Derivative assets, gross amount 672 865
Derivative liabilities, gross amount 678 1,014
Derivatives not designated as accounting hedges: | Interest rate contracts: | Other interest rate exposures    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 1,909 909
Derivative assets, gross amount 17 14
Derivative liabilities, gross amount 11 9
Derivatives not designated as accounting hedges: | Foreign exchange and other contracts | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 6,390 6,951
Derivative assets, gross amount 57 80
Derivative liabilities, gross amount 56 52
Derivatives not designated as accounting hedges: | Commodity contracts | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 40,298 34,185
Derivative assets, gross amount 1,231 858
Derivative liabilities, gross amount 1,096 814
Derivatives not designated as accounting hedges: | Other contracts    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 3,467 3,254
Derivative assets, gross amount 48 25
Derivative liabilities, gross amount $ 11 $ 5