v3.26.1
Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount $ 396,712 $ 385,710
Derivative assets, gross amount 3,412 2,201
Derivative liabilities, gross amount 2,925 2,129
Derivative Asset, netting adjustments (520) (408)
Derivative Liability, netting adjustments (338) (501)
Net Amounts as Recognized 2,892 1,793
Net Amounts as Recognized 2,587 1,628
Net valuation allowance on derivative assets and liabilities for non-performance risk 5 5
Derivatives designated as accounting hedges:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 197,007 200,680
Derivative assets, gross amount 299 176
Derivative liabilities, gross amount 90 277
Derivatives designated as accounting hedges: | Interest rate contracts:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 188,368 191,830
Derivative assets, gross amount 211 158
Derivative liabilities, gross amount 27 138
Derivatives designated as accounting hedges: | Interest rate contracts: | Fair value hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 62,068 60,580
Derivative assets, gross amount 30 13
Derivative liabilities, gross amount 8 52
Derivatives designated as accounting hedges: | Interest rate contracts: | Cash flow hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 126,300 131,250
Derivative assets, gross amount 181 145
Derivative liabilities, gross amount 19 86
Derivatives designated as accounting hedges: | Foreign exchange and other contracts    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 8,639 8,850
Derivative assets, gross amount 88 18
Derivative liabilities, gross amount 63 139
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Fair value hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 578 587
Derivative assets, gross amount 0 0
Derivative liabilities, gross amount 31 22
Derivatives designated as accounting hedges: | Foreign exchange and other contracts | Cash flow hedges    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 2,643 2,737
Derivative assets, gross amount 45 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 5,418 5,526
Derivative assets, gross amount 43 18
Derivative liabilities, gross amount 32 82
Derivatives not designated as accounting hedges:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 199,705 185,030
Derivative assets, gross amount 3,113 2,025
Derivative liabilities, gross amount 2,835 1,852
Derivatives not designated as accounting hedges: | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 194,931 179,654
Derivative assets, gross amount 3,037 1,960
Derivative liabilities, gross amount 2,822 1,830
Derivatives not designated as accounting hedges: | Interest rate contracts: | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 140,703 132,966
Derivative assets, gross amount 573 672
Derivative liabilities, gross amount 622 678
Derivatives not designated as accounting hedges: | Interest rate contracts: | Other interest rate exposures    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 1,543 1,909
Derivative assets, gross amount 18 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 5,893 6,390
Derivative assets, gross amount 66 57
Derivative liabilities, gross amount 53 56
Derivatives not designated as accounting hedges: | Commodity contracts | Customer accommodation:    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 48,335 40,298
Derivative assets, gross amount 2,398 1,231
Derivative liabilities, gross amount 2,147 1,096
Derivatives not designated as accounting hedges: | Other contracts    
Derivatives, Fair Value [Line Items]    
Notional or Contractual Amount 3,231 3,467
Derivative assets, gross amount 58 48
Derivative liabilities, gross amount $ 3 $ 11