v3.26.1
Loans and allowance for loan losses - Summary of Current, Past Due and Nonaccrual Loans (Detail) - USD ($)
$ in Millions
Jun. 30, 2026
Mar. 31, 2026
Jan. 01, 2026
Dec. 31, 2025
Jun. 30, 2025
Mar. 31, 2025
Jan. 01, 2025
Financing Receivable, Past Due [Line Items]              
Amortized Cost $ 1,208 $ 1,240 $ 1,252 $ 1,252 $ 1,573 $ 1,540 $ 1,690
Total [1] 143,193     138,702      
Unamortized loan cost (fee) and purchase premium (discount) (260)     276      
Financing receivable, accrued interest, before allowance for credit loss 625     627      
Current              
Financing Receivable, Past Due [Line Items]              
Loans 139,932     135,136      
30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 1,450     1,753      
Accruing Loans Past Due 90 Days or More              
Financing Receivable, Past Due [Line Items]              
Loans 603     561      
Commercial and industrial              
Financing Receivable, Past Due [Line Items]              
Amortized Cost 570 535 527 527 787 662 696
Total 66,143     63,548      
Commercial and industrial | Current              
Financing Receivable, Past Due [Line Items]              
Loans 65,198     62,626      
Commercial and industrial | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 371     390      
Commercial and industrial | Accruing Loans Past Due 90 Days or More              
Financing Receivable, Past Due [Line Items]              
Loans 4     5      
Commercial real estate | Commercial              
Financing Receivable, Past Due [Line Items]              
Amortized Cost 216 294 320 320 376 394 468
Total 21,234     20,192      
Mortgage loans held for sale 259     484      
Commercial real estate | Commercial | Current              
Financing Receivable, Past Due [Line Items]              
Loans 20,848     19,505      
Commercial real estate | Commercial | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 168     364      
Commercial real estate | Commercial | Accruing Loans Past Due 90 Days or More              
Financing Receivable, Past Due [Line Items]              
Loans 2     3      
Commercial real estate | Residential builder and developer              
Financing Receivable, Past Due [Line Items]              
Amortized Cost 0 0 0 0 1 1 2
Total 110     69      
Commercial real estate | Residential builder and developer | Current              
Financing Receivable, Past Due [Line Items]              
Loans 101     69      
Commercial real estate | Residential builder and developer | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 9     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 36 10 13 13 23 28 66
Total 3,148     3,558      
Commercial real estate | Other commercial construction | Current              
Financing Receivable, Past Due [Line Items]              
Loans 3,082     3,436      
Commercial real estate | Other commercial construction | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 30     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 262 272 264 264 265 284 279
Total 25,384     24,874      
Mortgage loans held for sale 256     441      
Residential real estate | Residential | Current              
Financing Receivable, Past Due [Line Items]              
Loans 23,891     23,410      
Total 23,891     23,410      
Residential real estate | Residential | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 644     657      
Residential real estate | Residential | Accruing Loans Past Due 90 Days or More              
Financing Receivable, Past Due [Line Items]              
Loans 587     543      
Total 587     543      
Consumer | Home equity lines and loans (e)              
Financing Receivable, Past Due [Line Items]              
Amortized Cost 77 84 82 82 75 78 81
Total 4,891     4,807      
Consumer | Home equity lines and loans (e) | Current              
Financing Receivable, Past Due [Line Items]              
Loans 4,781     4,690      
Total 4,781     4,690      
Consumer | Home equity lines and loans (e) | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 33     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 33 32 30 30 25 26 31
Total 14,856     14,092      
Consumer | Recreational finance | Current              
Financing Receivable, Past Due [Line Items]              
Loans 14,712     13,946      
Total 14,712     13,946      
Consumer | Recreational finance | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 111     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 10 9 11 11 9 11 12
Total 4,969     5,167      
Consumer | Automobile | Current              
Financing Receivable, Past Due [Line Items]              
Loans 4,899     5,097      
Total 4,899     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 $ 4 $ 5 5 $ 12 $ 56 $ 55
Total 2,458     2,395      
Consumer | Other | Current              
Financing Receivable, Past Due [Line Items]              
Loans 2,420     2,357      
Consumer | Other | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 24     23      
Consumer | Other | Accruing Loans Past Due 90 Days or More              
Financing Receivable, Past Due [Line Items]              
Loans $ 10     $ 10      
[1] Loans of $3.1 billion and $2.1 billion at June 30, 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 $2.8 billion at June 30, 2026 and $1.7 billion at December 31, 2025.