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Loans and allowance for loan losses - Summary of Current, Past Due and Nonaccrual Loans (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Jan. 01, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Jan. 01, 2024
Financing Receivable, Past Due [Line Items]              
Amortized Cost $ 1,512 $ 1,573 $ 1,690 $ 1,690 $ 1,926 $ 2,024 $ 2,166
Total [1] 136,974     135,581      
Unamortized loan cost (fee) and purchase premium (discount) (279)     277      
Financing receivable, accrued interest, before allowance for credit loss 619     628      
Current              
Financing Receivable, Past Due [Line Items]              
Loans 133,830     131,898      
30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 1,200     1,655      
Accruing Loans Past Due 90 Days or More              
Financing Receivable, Past Due [Line Items]              
Loans 432     338      
Commercial and industrial              
Financing Receivable, Past Due [Line Items]              
Amortized Cost 760 787 696 696 810 805 670
Total 61,887     61,481      
Commercial and industrial | Current              
Financing Receivable, Past Due [Line Items]              
Loans 60,952     60,374      
Commercial and industrial | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 172     399      
Commercial and industrial | Accruing Loans Past Due 90 Days or More              
Financing Receivable, Past Due [Line Items]              
Loans 3     12      
Commercial Real Estate | Commercial              
Financing Receivable, Past Due [Line Items]              
Amortized Cost 361 376 468 468 578 707 869
Total 20,062     20,780      
Mortgage loans held for sale 278     310      
Commercial Real Estate | Commercial | Current              
Financing Receivable, Past Due [Line Items]              
Loans 19,493     20,054      
Commercial Real Estate | Commercial | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 189     255      
Commercial Real Estate | Commercial | Accruing Loans Past Due 90 Days or More              
Financing Receivable, Past Due [Line Items]              
Loans 19     3      
Commercial Real Estate | Residential builder and developer              
Financing Receivable, Past Due [Line Items]              
Amortized Cost 0 1 2 2 2 2 3
Total 92     835      
Mortgage loans held for sale 661            
Commercial Real Estate | Residential builder and developer | Current              
Financing Receivable, Past Due [Line Items]              
Loans 80     830      
Commercial Real Estate | Residential builder and developer | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 12     3      
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 21 23 66 66 84 77 171
Total 3,892     5,149      
Commercial Real Estate | Other commercial construction | Current              
Financing Receivable, Past Due [Line Items]              
Loans 3,859     5,018      
Commercial Real Estate | Other commercial construction | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 12     65      
Commercial Real Estate | Other commercial construction | Accruing Loans Past Due 90 Days or More              
Financing Receivable, Past Due [Line Items]              
Loans 0     0      
Commercial Real Estate | Other Revenue Portfolio Segment              
Financing Receivable, Past Due [Line Items]              
Mortgage loans held for sale 15            
Residential Real Estate | Residential              
Financing Receivable, Past Due [Line Items]              
Amortized Cost 250 265 279 279 276 260 270
Total 24,662     23,166      
Mortgage loans held for sale 327     211      
Residential Real Estate | Residential | Current              
Financing Receivable, Past Due [Line Items]              
Loans 23,395     21,853      
Total 23,395     21,853      
Residential Real Estate | Residential | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 615     719      
Residential Real Estate | Residential | Accruing Loans Past Due 90 Days or More              
Financing Receivable, Past Due [Line Items]              
Loans 402     315      
Total 402     315      
Consumer | Home equity lines and loans              
Financing Receivable, Past Due [Line Items]              
Amortized Cost 77 75 81 81 82 79 81
Total 4,730     4,592      
Consumer | Home equity lines and loans | Current              
Financing Receivable, Past Due [Line Items]              
Loans 4,622     4,482      
Total 4,622     4,482      
Consumer | Home equity lines and loans | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 31     29      
Consumer | Home equity lines and loans | 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 29 25 31 31 28 25 36
Total 14,152     12,564      
Consumer | Recreational finance | Current              
Financing Receivable, Past Due [Line Items]              
Loans 14,032     12,429      
Total 14,032     12,429      
Consumer | Recreational finance | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 91     104      
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 12 12 11 11 14
Total 5,223     4,794      
Consumer | Automobile | Current              
Financing Receivable, Past Due [Line Items]              
Loans 5,157     4,724      
Total 5,157     4,724      
Consumer | Automobile | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 56     58      
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 $ 12 $ 55 55 $ 55 $ 58 $ 52
Total 2,274     2,220      
Consumer | Other | Current              
Financing Receivable, Past Due [Line Items]              
Loans 2,240     2,134      
Consumer | Other | 30-89 Days Past Due              
Financing Receivable, Past Due [Line Items]              
Loans 22     23      
Consumer | Other | Accruing Loans Past Due 90 Days or More              
Financing Receivable, Past Due [Line Items]              
Loans $ 8     $ 8      
[1] Loans of $2.3 billion and $1.5 billion at September 30, 2025 and December 31, 2024, 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 $1.9 billion at September 30, 2025 and $1.2 billion at December 31, 2024.