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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 | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Jan. 01, 2024 | Mar. 31, 2023 | Jan. 01, 2023
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Amortized Cost with Allowance | $ 1,056 | $ 883 | $ 1,056 | $ 883 |  |  |  |
Amortized Cost without Allowance | 968 | 1,553 | 968 | 1,553 |  |  |  |
Total | 2,024 | 2,436 | 2,024 | 2,436 |  |  |  |
Amortized Cost |  |  |  |  | $ 2,302 | $ 2,166 | $ 2,557 | $ 2,439
Interest Income Recognized | 34 | 13 | 47 | 30 |  |  |  |
Commercial and industrial |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 494 | 202 | 494 | 202 |  |  |  |
Amortized Cost without Allowance | 311 | 405 | 311 | 405 |  |  |  |
Total | 805 | 607 | 805 | 607 |  |  |  |
Amortized Cost |  |  |  |  | 864 | 670 | 569 | 504
Interest Income Recognized | 7 | 3 | 9 | 6 |  |  |  |
Commercial Real Estate | Commercial |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 315 | 376 | 315 | 376 |  |  |  |
Amortized Cost without Allowance | 392 | 816 | 392 | 816 |  |  |  |
Total | 707 | 1,192 | 707 | 1,192 |  |  |  |
Amortized Cost |  |  |  |  | 855 | 869 | 1,330 | 1,240
Interest Income Recognized | 20 | 4 | 26 | 9 |  |  |  |
Commercial Real Estate | Residential builder and developer |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 2 | 1 | 2 | 1 |  |  |  |
Amortized Cost without Allowance | 0 | 0 | 0 | 0 |  |  |  |
Total | 2 | 1 | 2 | 1 |  |  |  |
Amortized Cost |  |  |  |  | 3 | 3 | 3 | 1
Interest Income Recognized | 0 | 0 | 0 | 0 |  |  |  |
Commercial Real Estate | Other commercial construction |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 13 | 44 | 13 | 44 |  |  |  |
Amortized Cost without Allowance | 64 | 102 | 64 | 102 |  |  |  |
Total | 77 | 146 | 77 | 146 |  |  |  |
Amortized Cost |  |  |  |  | 141 | 171 | 143 | 125
Interest Income Recognized | 3 | 0 | 3 | 2 |  |  |  |
Residential Real Estate | Residential |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 95 | 91 | 95 | 91 |  |  |  |
Amortized Cost without Allowance | 110 | 148 | 110 | 148 |  |  |  |
Total | 205 | 239 | 205 | 239 |  |  |  |
Amortized Cost |  |  |  |  | 202 | 215 | 254 | 272
Interest Income Recognized | 3 | 4 | 6 | 9 |  |  |  |
Residential Real Estate | Residential — limited documentation |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 20 | 28 | 20 | 28 |  |  |  |
Amortized Cost without Allowance | 35 | 39 | 35 | 39 |  |  |  |
Total | 55 | 67 | 55 | 67 |  |  |  |
Amortized Cost |  |  |  |  | 53 | 55 | 69 | 78
Interest Income Recognized | 0 | 0 | 1 | 0 |  |  |  |
Consumer: | Home equity lines and loans |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 37 | 49 | 37 | 49 |  |  |  |
Amortized Cost without Allowance | 42 | 28 | 42 | 28 |  |  |  |
Total | 79 | 77 | 79 | 77 |  |  |  |
Amortized Cost |  |  |  |  | 87 | 81 | 81 | 85
Interest Income Recognized | 1 | 2 | 2 | 4 |  |  |  |
Consumer: | Recreational finance |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 15 | 23 | 15 | 23 |  |  |  |
Amortized Cost without Allowance | 10 | 9 | 10 | 9 |  |  |  |
Total | 25 | 32 | 25 | 32 |  |  |  |
Amortized Cost |  |  |  |  | 30 | 36 | 34 | 45
Interest Income Recognized | 0 | 0 | 0 | 0 |  |  |  |
Consumer: | Automobile |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 7 | 18 | 7 | 18 |  |  |  |
Amortized Cost without Allowance | 4 | 4 | 4 | 4 |  |  |  |
Total | 11 | 22 | 11 | 22 |  |  |  |
Amortized Cost |  |  |  |  | 13 | 14 | 27 | 40
Interest Income Recognized | 0 | 0 | 0 | 0 |  |  |  |
Consumer: | Other |  |  |  |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |  |  |  |
Amortized Cost with Allowance | 58 | 51 | 58 | 51 |  |  |  |
Amortized Cost without Allowance | 0 | 2 | 0 | 2 |  |  |  |
Total | 58 | 53 | 58 | 53 |  |  |  |
Amortized Cost |  |  |  |  | $ 54 | $ 52 | $ 47 | $ 49
Interest Income Recognized | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |

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