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Loans and leases and allowance for credit losses - Loan Modifications (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 1,130 | $ 1,586
Percent of Total Loan Class | 0.83% | 1.18%
Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 1,001 | $ 1,476
Other |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 100 | 52
Combination of Modification Types |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 29 | 58
Commercial Portfolio Segment |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 303 | $ 198
Percent of Total Loan Class | 0.49% | 0.35%
Commercial Portfolio Segment | Term Extension |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 212 | $ 169
Commercial Portfolio Segment | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 84 | 27
Commercial Portfolio Segment | Combination of Modification Types |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 7 | 2
Commercial Real Estate | Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 515 | $ 651
Percent of Total Loan Class | 2.48% | 2.57%
Commercial Real Estate | Residential builder and developer |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 2 | $ 71
Percent of Total Loan Class | 0.29% | 6.63%
Commercial Real Estate | Other commercial construction |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 130 | $ 488
Percent of Total Loan Class | 2.53% | 7.34%
Commercial Real Estate | Term Extension | Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 509 | $ 610
Commercial Real Estate | Term Extension | Residential builder and developer |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 2 | 69
Commercial Real Estate | Term Extension | Other commercial construction |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 130 | 480
Commercial Real Estate | Other | Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 2 | 0
Commercial Real Estate | Other | Residential builder and developer |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 0 | 2
Commercial Real Estate | Other | Other commercial construction |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 0 | 0
Commercial Real Estate | Combination of Modification Types | Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 4 | 41
Commercial Real Estate | Combination of Modification Types | Residential builder and developer |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 0 | 0
Commercial Real Estate | Combination of Modification Types | Other commercial construction |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 0 | 8
Residential Real Estate | Residential |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 177 | $ 177
Percent of Total Loan Class | 0.76% | 0.76%
Residential Real Estate | Term Extension | Residential |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 146 | $ 148
Residential Real Estate | Other | Residential |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 14 | 23
Residential Real Estate | Combination of Modification Types | Residential |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 17 | 6
Consumer: | Home equity lines and loans |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 2 | $ 1
Percent of Total Loan Class | 0.04% | 0.03%
Consumer: | Recreational finance |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 1 | $ 0
Percent of Total Loan Class | 0.01% | 0.00%
Consumer: | Automobile |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 0 | $ 0
Percent of Total Loan Class | 0.00% | 0.00%
Consumer: | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 0 | $ 0
Percent of Total Loan Class | 0.00% | 0.00%
Consumer: | Term Extension | Home equity lines and loans |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 1 | $ 0
Consumer: | Term Extension | Recreational finance |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 1 | 0
Consumer: | Term Extension | Automobile |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 0 | 0
Consumer: | Term Extension | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 0 | 0
Consumer: | Other | Home equity lines and loans |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 0 | 0
Consumer: | Other | Recreational finance |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 0 | 0
Consumer: | Other | Automobile |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 0 | 0
Consumer: | Other | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 0 | 0
Consumer: | Combination of Modification Types | Home equity lines and loans |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 1 | 1
Consumer: | Combination of Modification Types | Recreational finance |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 0 | 0
Consumer: | Combination of Modification Types | Automobile |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | 0 | 0
Consumer: | Combination of Modification Types | Other |  |
Financing Receivable, Modifications [Line Items] |  |
Modified in period | $ 0 | $ 0

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