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Loans and leases and allowance for credit losses - Summary of Current, Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost | $ 1,690 | $ 2,166 | $ 2,439 | $ 2,060
Total | 135,581 | 134,068 |  |
Current |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 131,898 | 129,839 |  |
30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 1,655 | 1,724 |  |
Accruing Loans Past Due 90 Days or More |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 338 | 339 |  |
Commercial Portfolio Segment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost | 696 | 670 | 504 | 371
Total | 61,481 | 57,010 |  |
Commercial Portfolio Segment | Current |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 60,374 | 56,091 |  |
Commercial Portfolio Segment | 30-89 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 399 | 238 |  |
Commercial Portfolio Segment | Accruing Loans Past Due 90 Days or More |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 12 | 11 |  |
Commercial Real Estate | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost | 468 | 869 | 1,240 | 919
Total | 20,780 | 25,277 |  |
Commercial Real Estate | Residential builder and developer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost | 2 | 3 | 1 | 3
Total | 835 | 1,073 |  |
Commercial Real Estate | Other commercial construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost | 66 | 171 | 125 | 111
Total | 5,149 | 6,653 |  |
Commercial Real Estate | Current | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 20,054 | 24,072 |  |
Commercial Real Estate | Current | Residential builder and developer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 830 | 1,065 |  |
Commercial Real Estate | Current | Other commercial construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 5,018 | 6,322 |  |
Commercial Real Estate | 30-89 Days Past Due | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 255 | 311 |  |
Commercial Real Estate | 30-89 Days Past Due | Residential builder and developer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 3 | 5 |  |
Commercial Real Estate | 30-89 Days Past Due | Other commercial construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 65 | 159 |  |
Commercial Real Estate | Accruing Loans Past Due 90 Days or More | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 3 | 25 |  |
Commercial Real Estate | Accruing Loans Past Due 90 Days or More | Residential builder and developer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 0 | 0 |  |
Commercial Real Estate | Accruing Loans Past Due 90 Days or More | Other commercial construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 0 | 1 |  |
Residential Real Estate | Residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost | 279 | 270 | 350 | 479
Total | 23,166 | 23,264 |  |
Residential Real Estate | Current | Residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 21,853 | 21,905 |  |
Total | 21,853 | 21,905 |  |
Residential Real Estate | 30-89 Days Past Due | Residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 719 | 794 |  |
Residential Real Estate | Accruing Loans Past Due 90 Days or More | Residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 315 | 295 |  |
Total | 315 | 295 |  |
Consumer: | Home equity lines and loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost | 81 | 81 | 85 | 70
Total | 4,592 | 4,649 |  |
Consumer: | Recreational finance |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost | 31 | 36 | 45 | 28
Total | 12,564 | 10,058 |  |
Consumer: | Automobile |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost | 12 | 14 | 40 | 34
Total | 4,794 | 3,992 |  |
Consumer: | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Amortized Cost | 55 | 52 | $ 49 | $ 45
Total | 2,220 | 2,092 |  |
Consumer: | Current | Home equity lines and loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 4,482 | 4,528 |  |
Total | 4,482 | 4,528 |  |
Consumer: | Current | Recreational finance |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 12,429 | 9,935 |  |
Total | 12,429 | 9,935 |  |
Consumer: | Current | Automobile |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 4,724 | 3,918 |  |
Total | 4,724 | 3,918 |  |
Consumer: | Current | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 2,134 | 2,003 |  |
Consumer: | 30-89 Days Past Due | Home equity lines and loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 29 | 40 |  |
Consumer: | 30-89 Days Past Due | Recreational finance |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 104 | 87 |  |
Consumer: | 30-89 Days Past Due | Automobile |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 58 | 60 |  |
Consumer: | 30-89 Days Past Due | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 23 | 30 |  |
Consumer: | Accruing Loans Past Due 90 Days or More | Home equity lines and loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 0 | 0 |  |
Total | 0 | 0 |  |
Consumer: | Accruing Loans Past Due 90 Days or More | Recreational finance |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 0 | 0 |  |
Total | 0 | 0 |  |
Consumer: | Accruing Loans Past Due 90 Days or More | Automobile |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 0 | 0 |  |
Total | 0 | 0 |  |
Consumer: | Accruing Loans Past Due 90 Days or More | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 8 | $ 7 |  |

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