v3.26.1
Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount $ 404,990 $ 385,710
Derivative assets, gross amount 2,443 2,201
Derivative liabilities, gross amount 2,523 2,129
Derivative Asset, netting adjustments (518) (408)
Derivative Liability, netting adjustments (300) (501)
Net Amounts as Recognized 1,925 1,793
Net Amounts as Recognized 2,223 1,628
Net valuation allowance on derivative assets and liabilities for non-performance risk 3 5
Derivatives designated as accounting hedges:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 203,205 200,680
Derivative assets, gross amount 271 176
Derivative liabilities, gross amount 350 277
Derivatives designated as accounting hedges: | Interest rate contracts:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 194,170 191,830
Derivative assets, gross amount 121 158
Derivative liabilities, gross amount 310 138
Derivatives designated as accounting hedges: | Interest rate contracts: | Fair value hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 57,369 60,580
Derivative assets, gross amount 31 13
Derivative liabilities, gross amount 115 52
Derivatives designated as accounting hedges: | Interest rate contracts: | Cash flow hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 136,801 131,250
Derivative assets, gross amount 90 145
Derivative liabilities, gross amount 195 86
Derivatives designated as accounting hedges: | Foreign exchange and other contracts    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 9,035 8,850
Derivative assets, gross amount 150 18
Derivative liabilities, gross amount 40 139
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Fair value hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 571 587
Derivative assets, gross amount 0 0
Derivative liabilities, gross amount 40 22
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Cash flow hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 2,938 2,737
Derivative assets, gross amount 46 0
Derivative liabilities, gross amount 0 35
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Net investment hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 5,526 5,526
Derivative assets, gross amount 104 18
Derivative liabilities, gross amount 0 82
Derivatives not designated as accounting hedges:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 201,785 185,030
Derivative assets, gross amount 2,172 2,025
Derivative liabilities, gross amount 2,173 1,852
Derivatives not designated as accounting hedges: | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 196,666 179,654
Derivative assets, gross amount 2,100 1,960
Derivative liabilities, gross amount 2,152 1,830
Derivatives not designated as accounting hedges: | Interest rate contracts: | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 142,623 132,966
Derivative assets, gross amount 626 672
Derivative liabilities, gross amount 722 678
Derivatives not designated as accounting hedges: | Interest rate contracts: | Other interest rate exposures    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 1,633 1,909
Derivative assets, gross amount 17 17
Derivative liabilities, gross amount 10 11
Derivatives not designated as accounting hedges: | Foreign exchange and other contracts | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 5,689 6,390
Derivative assets, gross amount 57 57
Derivative liabilities, gross amount 44 56
Derivatives not designated as accounting hedges: | Commodity contracts | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 48,354 40,298
Derivative assets, gross amount 1,417 1,231
Derivative liabilities, gross amount 1,386 1,096
Derivatives not designated as accounting hedges: | Other contracts    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 3,486 3,467
Derivative assets, gross amount 55 48
Derivative liabilities, gross amount $ 11 $ 11