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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.

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