v3.26.3
Loans and ACL - Loans Modified During Period That Were in Payment Default (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default $ 225 $ 278
Renewals    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 35 46
Term Extensions    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 10 13
Interest Rate Adjustments    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 3 3
Capitalizations    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 9 3
Payment Delays    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 106 157
Combination - Capitalization and Term Extension    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 49 44
Other    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 13 12
Commercial: | Commercial and industrial    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 37 46
Commercial: | Commercial and industrial | Renewals    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 34 46
Commercial: | Commercial and industrial | Term Extensions    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Commercial: | Commercial and industrial | Interest Rate Adjustments    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Commercial: | Commercial and industrial | Capitalizations    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Commercial: | Commercial and industrial | Payment Delays    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Commercial: | Commercial and industrial | Combination - Capitalization and Term Extension    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Commercial: | Commercial and industrial | Other    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 3 0
Commercial: | CRE    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 1 0
Commercial: | CRE | Renewals    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 1 0
Commercial: | CRE | Term Extensions    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Commercial: | CRE | Interest Rate Adjustments    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Commercial: | CRE | Capitalizations    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Commercial: | CRE | Payment Delays    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Commercial: | CRE | Combination - Capitalization and Term Extension    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Commercial: | CRE | Other    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Consumer: | Residential mortgage    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 181 157
Consumer: | Residential mortgage | Renewals    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Consumer: | Residential mortgage | Term Extensions    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 7 11
Consumer: | Residential mortgage | Interest Rate Adjustments    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Consumer: | Residential mortgage | Capitalizations    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 9 3
Consumer: | Residential mortgage | Payment Delays    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 106 90
Consumer: | Residential mortgage | Combination - Capitalization and Term Extension    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 49 44
Consumer: | Residential mortgage | Other    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 10 9
Consumer: | Indirect auto    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 2 71
Consumer: | Indirect auto | Renewals    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Consumer: | Indirect auto | Term Extensions    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 2 1
Consumer: | Indirect auto | Interest Rate Adjustments    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Consumer: | Indirect auto | Capitalizations    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Consumer: | Indirect auto | Payment Delays    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 67
Consumer: | Indirect auto | Combination - Capitalization and Term Extension    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Consumer: | Indirect auto | Other    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 3
Consumer: | Other consumer    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 1 1
Consumer: | Other consumer | Renewals    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Consumer: | Other consumer | Term Extensions    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 1 1
Consumer: | Other consumer | Interest Rate Adjustments    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Consumer: | Other consumer | Capitalizations    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Consumer: | Other consumer | Payment Delays    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Consumer: | Other consumer | Combination - Capitalization and Term Extension    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Consumer: | Other consumer | Other    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Credit card    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 3 3
Credit card | Renewals    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Credit card | Term Extensions    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Credit card | Interest Rate Adjustments    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 3 3
Credit card | Capitalizations    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Credit card | Payment Delays    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Credit card | Combination - Capitalization and Term Extension    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default 0 0
Credit card | Other    
Financing Receivable, Modified, Subsequent Default [Line Items]    
Loans modified, in payment default $ 0 $ 0