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Derivative Financial Instruments - Classifications and Hedging Relationships (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount $ 502,765 $ 493,990
Derivative assets, fair value 3,644 3,122
Derivative liability, fair value (5,331) (4,615)
Derivative Asset [Abstract]    
Amounts subject to master netting arrangements and exchange traded derivatives (1,963) (1,585)
Cash collateral (received) posted for amounts subject to master netting arrangements (226) (194)
Net amount 1,455 1,343
Derivative Liability [Abstract]    
Amounts subject to master netting arrangements and exchange traded derivatives 1,963 1,585
Cash collateral (received) posted for amounts subject to master netting arrangements 1,140 1,233
Net amount (2,228) (1,797)
Swaps hedging commercial loans | Interest rate contracts: | Swaps | Location, Statement of Financial Position, Balance [Axis]: us-gaap:FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 83,672 97,135
Derivative assets, fair value 0 0
Derivative liability, fair value (6) 0
Total derivatives designated as hedges | Interest rate contracts:    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 135,802 150,919
Derivative assets, fair value 0 0
Derivative liability, fair value (8) 0
Total derivatives designated as hedges | Interest rate contracts: | Swaps | Location, Statement of Financial Position, Balance [Axis]: us-gaap:AvailableForSaleSecuritiesDebtSecurities    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 23,730 26,751
Derivative assets, fair value 0 0
Derivative liability, fair value (1) 0
Total derivatives designated as hedges | Interest rate contracts: | Swaps | Location, Statement of Financial Position, Balance [Axis]: us-gaap:LongTermDebt    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 28,400 27,033
Derivative assets, fair value 0 0
Derivative liability, fair value (1) 0
Not designated as hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 366,963 343,071
Derivative assets, fair value 3,644 3,122
Derivative liability, fair value (5,323) (4,615)
Not designated as hedges | Client-related and other risk management:    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 332,126 311,516
Derivative assets, fair value 3,612 3,092
Derivative liability, fair value (5,234) (4,495)
Not designated as hedges | Client-related and other risk management: | Interest rate contracts: | Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 195,669 185,861
Derivative assets, fair value 411 516
Derivative liability, fair value (1,115) (944)
Not designated as hedges | Client-related and other risk management: | Interest rate contracts: | Written options    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 10,712 10,577
Derivative assets, fair value 1 2
Derivative liability, fair value (28) (18)
Not designated as hedges | Client-related and other risk management: | Interest rate contracts: | Purchased options    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 5,792 8,558
Derivative assets, fair value 15 15
Derivative liability, fair value 0 0
Not designated as hedges | Client-related and other risk management: | Interest rate contracts: | Futures and forwards    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 2,997 2,636
Derivative assets, fair value 1 2
Derivative liability, fair value (3) (14)
Not designated as hedges | Client-related and other risk management: | Foreign exchange contracts: | Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 16,539 13,647
Derivative assets, fair value 418 450
Derivative liability, fair value (372) (382)
Not designated as hedges | Client-related and other risk management: | Foreign exchange contracts: | Futures and forwards    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 27,887 27,008
Derivative assets, fair value 374 338
Derivative liability, fair value (332) (335)
Not designated as hedges | Client-related and other risk management: | Foreign exchange contracts: | Other    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 2,615 2,820
Derivative assets, fair value 29 35
Derivative liability, fair value (26) (33)
Not designated as hedges | Client-related and other risk management: | Equity contracts: | Written options    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 30,311 26,600
Derivative assets, fair value 18 12
Derivative liability, fair value (2,770) (2,278)
Not designated as hedges | Client-related and other risk management: | Equity contracts: | Purchased options    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 13,989 12,485
Derivative assets, fair value 1,800 1,358
Derivative liability, fair value (139) (121)
Not designated as hedges | Client-related and other risk management: | Equity contracts: | Other    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 2,521 1,386
Derivative assets, fair value 74 11
Derivative liability, fair value (22) (59)
Not designated as hedges | Client-related and other risk management: | Commodity contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 10,920 8,340
Derivative assets, fair value 437 322
Derivative liability, fair value (417) (302)
Not designated as hedges | Client-related and other risk management: | Credit contracts: | Credit default swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 1,181 900
Derivative assets, fair value 0 0
Derivative liability, fair value (3) 0
Not designated as hedges | Client-related and other risk management: | Credit contracts: | Total return swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 1,782 1,835
Derivative assets, fair value 34 31
Derivative liability, fair value (5) (7)
Not designated as hedges | Client-related and other risk management: | Credit contracts: | Risk participation agreements    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 9,211 8,863
Derivative assets, fair value 0 0
Derivative liability, fair value (2) (2)
Not designated as hedges | MSRs and mortgage banking: | Interest rate contracts:    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 34,837 31,555
Derivative assets, fair value 32 30
Derivative liability, fair value (89) (120)
Not designated as hedges | MSRs and mortgage banking: | Interest rate contracts: | Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 15,605 11,035
Derivative assets, fair value 0 0
Derivative liability, fair value 0 0
Not designated as hedges | MSRs and mortgage banking: | Interest rate contracts: | Written options    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 568 1,288
Derivative assets, fair value 11 14
Derivative liability, fair value 0 0
Not designated as hedges | MSRs and mortgage banking: | Interest rate contracts: | Purchased options    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 9,550 10,465
Derivative assets, fair value 6 10
Derivative liability, fair value (75) (118)
Not designated as hedges | MSRs and mortgage banking: | Interest rate contracts: | Interest rate lock commitments    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 1,271 960
Derivative assets, fair value 5 4
Derivative liability, fair value (10) (2)
Not designated as hedges | MSRs and mortgage banking: | Interest rate contracts: | When issued securities, forward rate agreements, forward commitments, and futures    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional or Contractual Amount 7,843 7,807
Derivative assets, fair value 10 2
Derivative liability, fair value $ (4) $ 0