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Loans and allowance for loan losses - Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Jan. 01, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Jan. 01, 2024
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | $ 1,056 | $ 1,235 | $ 1,056 | $ 1,235 |  |  |  |  |
Amortized Cost without Allowance | 456 | 691 | 456 | 691 |  |  |  |  |
Total | 1,512 | 1,926 | 1,512 | 1,926 | $ 1,573 | $ 1,690 | $ 1,690 | $ 2,024 | $ 2,166
Amortized Cost | 1,512 | 1,926 | 1,512 | 1,926 | 1,573 | 1,690 | 1,690 | 2,024 | 2,166
Interest Income Recognized | 27 | 17 | 67 | 64 |  |  |  |  |
Commercial and industrial |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 652 | 610 | 652 | 610 |  |  |  |  |
Amortized Cost without Allowance | 108 | 200 | 108 | 200 |  |  |  |  |
Total | 760 | 810 | 760 | 810 | 787 | 696 | 696 | 805 | 670
Amortized Cost | 760 | 810 | 760 | 810 | 787 | 696 | 696 | 805 | 670
Interest Income Recognized | 8 | 5 | 20 | 14 |  |  |  |  |
Commercial Real Estate | Commercial |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 217 | 348 | 217 | 348 |  |  |  |  |
Amortized Cost without Allowance | 144 | 230 | 144 | 230 |  |  |  |  |
Total | 361 | 578 | 361 | 578 | 376 | 468 | 468 | 707 | 869
Amortized Cost | 361 | 578 | 361 | 578 | 376 | 468 | 468 | 707 | 869
Interest Income Recognized | 11 | 5 | 28 | 31 |  |  |  |  |
Commercial Real Estate | Residential builder and developer |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 0 | 2 | 0 | 2 |  |  |  |  |
Amortized Cost without Allowance | 0 | 0 | 0 | 0 |  |  |  |  |
Total | 0 | 2 | 0 | 2 | 1 | 2 | 2 | 2 | 3
Amortized Cost | 0 | 2 | 0 | 2 | 1 | 2 | 2 | 2 | 3
Interest Income Recognized | 0 | 1 | 0 | 1 |  |  |  |  |
Commercial Real Estate | Other commercial construction |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 13 | 21 | 13 | 21 |  |  |  |  |
Amortized Cost without Allowance | 8 | 63 | 8 | 63 |  |  |  |  |
Total | 21 | 84 | 21 | 84 | 23 | 66 | 66 | 77 | 171
Amortized Cost | 21 | 84 | 21 | 84 | 23 | 66 | 66 | 77 | 171
Interest Income Recognized | 2 | 0 | 2 | 3 |  |  |  |  |
Residential Real Estate | Residential |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 105 | 135 | 105 | 135 |  |  |  |  |
Amortized Cost without Allowance | 145 | 141 | 145 | 141 |  |  |  |  |
Total | 250 | 276 | 250 | 276 | 265 | 279 | 279 | 260 | 270
Amortized Cost | 250 | 276 | 250 | 276 | 265 | 279 | 279 | 260 | 270
Interest Income Recognized | 4 | 4 | 11 | 11 |  |  |  |  |
Consumer | Home equity lines and loans |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 37 | 39 | 37 | 39 |  |  |  |  |
Amortized Cost without Allowance | 40 | 43 | 40 | 43 |  |  |  |  |
Total | 77 | 82 | 77 | 82 | 75 | 81 | 81 | 79 | 81
Amortized Cost | 77 | 82 | 77 | 82 | 75 | 81 | 81 | 79 | 81
Interest Income Recognized | 2 | 2 | 6 | 4 |  |  |  |  |
Consumer | Recreational finance |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 20 | 17 | 20 | 17 |  |  |  |  |
Amortized Cost without Allowance | 9 | 11 | 9 | 11 |  |  |  |  |
Total | 29 | 28 | 29 | 28 | 25 | 31 | 31 | 25 | 36
Amortized Cost | 29 | 28 | 29 | 28 | 25 | 31 | 31 | 25 | 36
Interest Income Recognized | 0 | 0 | 0 | 0 |  |  |  |  |
Consumer | Automobile |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 8 | 8 | 8 | 8 |  |  |  |  |
Amortized Cost without Allowance | 2 | 3 | 2 | 3 |  |  |  |  |
Total | 10 | 11 | 10 | 11 | 9 | 12 | 12 | 11 | 14
Amortized Cost | 10 | 11 | 10 | 11 | 9 | 12 | 12 | 11 | 14
Interest Income Recognized | 0 | 0 | 0 | 0 |  |  |  |  |
Consumer | Other |  |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 4 | 55 | 4 | 55 |  |  |  |  |
Amortized Cost without Allowance | 0 | 0 | 0 | 0 |  |  |  |  |
Total | 4 | 55 | 4 | 55 | 12 | 55 | 55 | 58 | 52
Amortized Cost | 4 | 55 | 4 | 55 | $ 12 | $ 55 | $ 55 | $ 58 | $ 52
Interest Income Recognized | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |

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