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Commitments, Contingent Liabilities, and Guarantees - Commitments to Extend Credit or Funding (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Guarantor Obligations [Line Items]    
Total loan commitments $ 75,085 $ 79,076
Commercial letters of credit 65 86
Purchase card commitments 995 875
Principal investing commitments 1 9
Tax credit investment commitments 1,361 958
Total loan and other commitments 77,507 81,004
Commercial and other    
Guarantor Obligations [Line Items]    
Total loan commitments 55,603 58,269
Commercial real estate and construction    
Guarantor Obligations [Line Items]    
Total loan commitments 3,440 4,037
Home equity    
Guarantor Obligations [Line Items]    
Total loan commitments 8,984 9,346
Credit cards    
Guarantor Obligations [Line Items]    
Total loan commitments $ 7,058 $ 7,424