v3.26.3
Loans and ACL - Delinquency Status of Loans that Were Modified During the Period (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Sep. 30, 2025
Financing Receivable, Modified    
Loans modified $ 2,482 $ 3,837
Current    
Financing Receivable, Modified    
Loans modified 2,096 3,199
30-89 Days Past Due    
Financing Receivable, Modified    
Loans modified 161 360
90 Days or More Past Due    
Financing Receivable, Modified    
Loans modified 225 278
Nonperforming    
Financing Receivable, Modified    
Loans modified 338 443
Nonperforming | Current    
Financing Receivable, Modified    
Loans modified 207 231
Nonperforming | 30-89 Days Past Due    
Financing Receivable, Modified    
Loans modified 50 41
Nonperforming | 90 Days or More Past Due    
Financing Receivable, Modified    
Loans modified 81 171
Commercial: | Commercial and industrial    
Financing Receivable, Modified    
Loans modified 793 978
Commercial: | Commercial and industrial | Current    
Financing Receivable, Modified    
Loans modified 725 930
Commercial: | Commercial and industrial | 30-89 Days Past Due    
Financing Receivable, Modified    
Loans modified 31 2
Commercial: | Commercial and industrial | 90 Days or More Past Due    
Financing Receivable, Modified    
Loans modified 37 46
Commercial: | CRE    
Financing Receivable, Modified    
Loans modified 657 563
Commercial: | CRE | Current    
Financing Receivable, Modified    
Loans modified 656 562
Commercial: | CRE | 30-89 Days Past Due    
Financing Receivable, Modified    
Loans modified 0 1
Commercial: | CRE | 90 Days or More Past Due    
Financing Receivable, Modified    
Loans modified 1 0
Commercial: | Commercial construction    
Financing Receivable, Modified    
Loans modified 264 294
Commercial: | Commercial construction | Current    
Financing Receivable, Modified    
Loans modified 264 294
Commercial: | Commercial construction | 30-89 Days Past Due    
Financing Receivable, Modified    
Loans modified 0 0
Commercial: | Commercial construction | 90 Days or More Past Due    
Financing Receivable, Modified    
Loans modified 0 0
Consumer: | Residential mortgage    
Financing Receivable, Modified    
Loans modified 655 642
Consumer: | Residential mortgage | Current    
Financing Receivable, Modified    
Loans modified 359 366
Consumer: | Residential mortgage | 30-89 Days Past Due    
Financing Receivable, Modified    
Loans modified 115 119
Consumer: | Residential mortgage | 90 Days or More Past Due    
Financing Receivable, Modified    
Loans modified 181 157
Consumer: | Home equity    
Financing Receivable, Modified    
Loans modified 3 5
Consumer: | Home equity | Current    
Financing Receivable, Modified    
Loans modified 3 5
Consumer: | Home equity | 30-89 Days Past Due    
Financing Receivable, Modified    
Loans modified 0 0
Consumer: | Home equity | 90 Days or More Past Due    
Financing Receivable, Modified    
Loans modified 0 0
Consumer: | Indirect auto    
Financing Receivable, Modified    
Loans modified 53 1,297
Consumer: | Indirect auto | Current    
Financing Receivable, Modified    
Loans modified 41 994
Consumer: | Indirect auto | 30-89 Days Past Due    
Financing Receivable, Modified    
Loans modified 10 232
Consumer: | Indirect auto | 90 Days or More Past Due    
Financing Receivable, Modified    
Loans modified 2 71
Consumer: | Other consumer    
Financing Receivable, Modified    
Loans modified 33 34
Consumer: | Other consumer | Current    
Financing Receivable, Modified    
Loans modified 30 31
Consumer: | Other consumer | 30-89 Days Past Due    
Financing Receivable, Modified    
Loans modified 2 2
Consumer: | Other consumer | 90 Days or More Past Due    
Financing Receivable, Modified    
Loans modified 1 1
Credit card    
Financing Receivable, Modified    
Loans modified 24 24
Credit card | Current    
Financing Receivable, Modified    
Loans modified 18 17
Credit card | 30-89 Days Past Due    
Financing Receivable, Modified    
Loans modified 3 4
Credit card | 90 Days or More Past Due    
Financing Receivable, Modified    
Loans modified $ 3 $ 3