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Loans and Leases and the Allowance for Credit Losses - Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans (Detail) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Jan. 01, 2024 | Jan. 01, 2023
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Amortized Cost with Allowance | $ 1,139 | $ 1,232 |  |  |
Amortized Cost without Allowance | 401 | 1,070 |  |  |
Total | 1,540 | 2,302 | $ 1,690 | $ 1,690 | $ 2,166
Amortized Cost | 1,540 | 2,302 | 1,690 | 1,690 | 2,166
Interest Income Recognized | 18 | 13 |  |  |
Commercial and industrial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Amortized Cost with Allowance | 522 | 590 |  |  |
Amortized Cost without Allowance | 140 | 274 |  |  |
Total | 662 | 864 | 696 | 696 | 670
Amortized Cost | 662 | 864 | 696 | 696 | 670
Interest Income Recognized | 6 | 2 |  |  |
Commercial Real Estate | Commercial |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Amortized Cost with Allowance | 341 | 379 |  |  |
Amortized Cost without Allowance | 53 | 476 |  |  |
Total | 394 | 855 | 468 | 468 | 869
Amortized Cost | 394 | 855 | 468 | 468 | 869
Interest Income Recognized | 7 | 6 |  |  |
Commercial Real Estate | Residential builder and developer |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Amortized Cost with Allowance | 1 | 3 |  |  |
Amortized Cost without Allowance | 0 | 0 |  |  |
Total | 1 | 3 | 2 | 2 | 3
Amortized Cost | 1 | 3 | 2 | 2 | 3
Interest Income Recognized | 0 | 0 |  |  |
Commercial Real Estate | Other commercial construction |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Amortized Cost with Allowance | 23 | 33 |  |  |
Amortized Cost without Allowance | 5 | 108 |  |  |
Total | 28 | 141 | 66 | 66 | 171
Amortized Cost | 28 | 141 | 66 | 66 | 171
Interest Income Recognized | 0 | 0 |  |  |
Residential Real Estate | Residential |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Amortized Cost with Allowance | 135 | 100 |  |  |
Amortized Cost without Allowance | 149 | 155 |  |  |
Total | 284 | 255 | 279 | 279 | 270
Amortized Cost | 284 | 255 | 279 | 279 | 270
Interest Income Recognized | 3 | 4 |  |  |
Consumer: | Home equity lines and loans |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Amortized Cost with Allowance | 36 | 48 |  |  |
Amortized Cost without Allowance | 42 | 39 |  |  |
Total | 78 | 87 | 81 | 81 | 81
Amortized Cost | 78 | 87 | 81 | 81 | 81
Interest Income Recognized | 2 | 1 |  |  |
Consumer: | Recreational finance |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Amortized Cost with Allowance | 17 | 18 |  |  |
Amortized Cost without Allowance | 9 | 12 |  |  |
Total | 26 | 30 | 31 | 31 | 36
Amortized Cost | 26 | 30 | 31 | 31 | 36
Interest Income Recognized | 0 | 0 |  |  |
Consumer: | Automobile |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Amortized Cost with Allowance | 8 | 7 |  |  |
Amortized Cost without Allowance | 3 | 6 |  |  |
Total | 11 | 13 | 12 | 12 | 14
Amortized Cost | 11 | 13 | 12 | 12 | 14
Interest Income Recognized | 0 | 0 |  |  |
Consumer: | Other |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Amortized Cost with Allowance | 56 | 54 |  |  |
Amortized Cost without Allowance | 0 | 0 |  |  |
Total | 56 | 54 | 55 | 55 | 52
Amortized Cost | 56 | 54 | $ 55 | $ 55 | $ 52
Interest Income Recognized | $ 0 | $ 0 |  |  |

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