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Loans and Leases and the Allowance for Credit Losses - Summary of Current, Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-89 Days Past Due | $ 1,410 | $ 1,724
Accruing Loans Past Due 90 Days or More | 297 | 339
Nonaccrual | 2,302 | 2,166
Loans and leases, net of unearned discount | 134,973 | 134,068
Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 130,964 | 129,839
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-89 Days Past Due | 219 | 238
Accruing Loans Past Due 90 Days or More | 11 | 11
Nonaccrual | 864 | 670
Loans and leases, net of unearned discount | 57,897 | 57,010
Commercial and Industrial [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 56,803 | 56,091
Commercial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-89 Days Past Due | 163 | 311
Accruing Loans Past Due 90 Days or More | 31 | 25
Nonaccrual | 855 | 869
Loans and leases, net of unearned discount | 25,168 | 25,277
Commercial [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 24,119 | 24,072
Residential Builder and Developer [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-89 Days Past Due | 48 | 5
Nonaccrual | 3 | 3
Loans and leases, net of unearned discount | 1,035 | 1,073
Residential Builder and Developer [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 984 | 1,065
Other Commercial Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-89 Days Past Due | 155 | 159
Accruing Loans Past Due 90 Days or More | 2 | 1
Nonaccrual | 141 | 171
Loans and leases, net of unearned discount | 6,213 | 6,653
Other Commercial Construction [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,915 | 6,322
Residential [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-89 Days Past Due | 627 | 763
Accruing Loans Past Due 90 Days or More | 245 | 295
Nonaccrual | 202 | 215
Loans and leases, net of unearned discount | 22,192 | 22,353
Residential [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 21,118 | 21,080
Residential Limited Documentation [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-89 Days Past Due | 30 | 31
Nonaccrual | 53 | 55
Loans and leases, net of unearned discount | 884 | 911
Residential Limited Documentation [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 801 | 825
Home Equity Lines and Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-89 Days Past Due | 34 | 40
Nonaccrual | 87 | 81
Loans and leases, net of unearned discount | 4,558 | 4,649
Home Equity Lines and Loans [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,437 | 4,528
Recreational Finance [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-89 Days Past Due | 71 | 87
Nonaccrual | 30 | 36
Loans and leases, net of unearned discount | 10,654 | 10,058
Recreational Finance [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 10,553 | 9,935
Automobile [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-89 Days Past Due | 43 | 60
Nonaccrual | 13 | 14
Loans and leases, net of unearned discount | 4,308 | 3,992
Automobile [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,252 | 3,918
Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
30-89 Days Past Due | 20 | 30
Accruing Loans Past Due 90 Days or More | 8 | 7
Nonaccrual | 54 | 52
Loans and leases, net of unearned discount | 2,064 | 2,092
Other [Member] | Current [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,982 | $ 2,003

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