v3.26.1
Loans and allowance for loan losses - Summary of Current, Past Due and Nonaccrual Loans (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Jan. 01, 2026
Dec. 31, 2025
Mar. 31, 2025
Jan. 01, 2025
Financing Receivable, Past Due [Line Items]          
Amortized Cost $ 1,240 $ 1,252 $ 1,252 $ 1,540 $ 1,690
Total [1] 139,914   138,702    
Unamortized loan cost (fee) and purchase premium (discount) (269)   276    
Financing receivable, accrued interest, before allowance for credit loss 616   627    
Current          
Financing Receivable, Past Due [Line Items]          
Loans 136,694   135,136    
30-89 Days Past Due          
Financing Receivable, Past Due [Line Items]          
Loans 1,334   1,753    
Accruing Loans Past Due 90 Days or More          
Financing Receivable, Past Due [Line Items]          
Loans 646   561    
Commercial and industrial          
Financing Receivable, Past Due [Line Items]          
Amortized Cost 535 527 527 662 696
Total 65,391   63,548    
Commercial and industrial | Current          
Financing Receivable, Past Due [Line Items]          
Loans 64,543   62,626    
Commercial and industrial | 30-89 Days Past Due          
Financing Receivable, Past Due [Line Items]          
Loans 311   390    
Commercial and industrial | Accruing Loans Past Due 90 Days or More          
Financing Receivable, Past Due [Line Items]          
Loans 2   5    
Commercial Real Estate | Commercial          
Financing Receivable, Past Due [Line Items]          
Amortized Cost 294 320 320 394 468
Total 20,030   20,192    
Mortgage loans held for sale 359   484    
Commercial Real Estate | Commercial | Current          
Financing Receivable, Past Due [Line Items]          
Loans 19,607   19,505    
Commercial Real Estate | Commercial | 30-89 Days Past Due          
Financing Receivable, Past Due [Line Items]          
Loans 129   364    
Commercial Real Estate | Commercial | Accruing Loans Past Due 90 Days or More          
Financing Receivable, Past Due [Line Items]          
Loans 0   3    
Commercial Real Estate | Residential builder and developer          
Financing Receivable, Past Due [Line Items]          
Amortized Cost 0 0 0 1 2
Total 110   69    
Commercial Real Estate | Residential builder and developer | Current          
Financing Receivable, Past Due [Line Items]          
Loans 110   69    
Commercial Real Estate | Residential builder and developer | 30-89 Days Past Due          
Financing Receivable, Past Due [Line Items]          
Loans 0   0    
Commercial Real Estate | Residential builder and developer | Accruing Loans Past Due 90 Days or More          
Financing Receivable, Past Due [Line Items]          
Loans 0   0    
Commercial Real Estate | Other commercial construction          
Financing Receivable, Past Due [Line Items]          
Amortized Cost 10 13 13 28 66
Total 3,205   3,558    
Commercial Real Estate | Other commercial construction | Current          
Financing Receivable, Past Due [Line Items]          
Loans 3,091   3,436    
Commercial Real Estate | Other commercial construction | 30-89 Days Past Due          
Financing Receivable, Past Due [Line Items]          
Loans 104   109    
Commercial Real Estate | Other commercial construction | Accruing Loans Past Due 90 Days or More          
Financing Receivable, Past Due [Line Items]          
Loans 0   0    
Residential Real Estate | Residential          
Financing Receivable, Past Due [Line Items]          
Amortized Cost 272 264 264 284 279
Total 24,857   24,874    
Mortgage loans held for sale 327   441    
Residential Real Estate | Residential | Current          
Financing Receivable, Past Due [Line Items]          
Loans 23,398   23,410    
Total 23,398   23,410    
Residential Real Estate | Residential | 30-89 Days Past Due          
Financing Receivable, Past Due [Line Items]          
Loans 553   657    
Residential Real Estate | Residential | Accruing Loans Past Due 90 Days or More          
Financing Receivable, Past Due [Line Items]          
Loans 634   543    
Total 634   543    
Consumer | Home equity lines and loans (e)          
Financing Receivable, Past Due [Line Items]          
Amortized Cost 84 82 82 78 81
Total 4,796   4,807    
Consumer | Home equity lines and loans (e) | Current          
Financing Receivable, Past Due [Line Items]          
Loans 4,681   4,690    
Total 4,681   4,690    
Consumer | Home equity lines and loans (e) | 30-89 Days Past Due          
Financing Receivable, Past Due [Line Items]          
Loans 31   35    
Consumer | Home equity lines and loans (e) | Accruing Loans Past Due 90 Days or More          
Financing Receivable, Past Due [Line Items]          
Loans 0   0    
Total 0   0    
Consumer | Recreational finance          
Financing Receivable, Past Due [Line Items]          
Amortized Cost 32 30 30 26 31
Total 14,144   14,092    
Consumer | Recreational finance | Current          
Financing Receivable, Past Due [Line Items]          
Loans 14,003   13,946    
Total 14,003   13,946    
Consumer | Recreational finance | 30-89 Days Past Due          
Financing Receivable, Past Due [Line Items]          
Loans 109   116    
Consumer | Recreational finance | Accruing Loans Past Due 90 Days or More          
Financing Receivable, Past Due [Line Items]          
Loans 0   0    
Total 0   0    
Consumer | Automobile          
Financing Receivable, Past Due [Line Items]          
Amortized Cost 9 11 11 11 12
Total 5,016   5,167    
Consumer | Automobile | Current          
Financing Receivable, Past Due [Line Items]          
Loans 4,947   5,097    
Total 4,947   5,097    
Consumer | Automobile | 30-89 Days Past Due          
Financing Receivable, Past Due [Line Items]          
Loans 60   59    
Consumer | Automobile | Accruing Loans Past Due 90 Days or More          
Financing Receivable, Past Due [Line Items]          
Loans 0   0    
Total 0   0    
Consumer | Other          
Financing Receivable, Past Due [Line Items]          
Amortized Cost 4 $ 5 5 $ 56 $ 55
Total 2,365   2,395    
Consumer | Other | Current          
Financing Receivable, Past Due [Line Items]          
Loans 2,314   2,357    
Consumer | Other | 30-89 Days Past Due          
Financing Receivable, Past Due [Line Items]          
Loans 37   23    
Consumer | Other | Accruing Loans Past Due 90 Days or More          
Financing Receivable, Past Due [Line Items]          
Loans $ 10   $ 10    
[1] Loans of $2.4 billion and $2.1 billion at March 31, 2026 and December 31, 2025, respectively, were held in special purpose trusts to settle the respective obligations of asset-backed notes issued by those trusts. The outstanding balances of those asset-backed notes issued to third party investors were included in Long-term borrowings and were $2.0 billion at March 31, 2026 and $1.7 billion at December 31, 2025.