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Loans and Leases and the Allowance for Credit Losses - Loan Modification Activities to Borrowers Experiencing Financial Difficulty on Financing Receivables (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 638 | $ 304
Percent of total loan class | 0.47% | 0.23%
Payment Deferral [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 634 | $ 302
Combination of Modification Types [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | 4 | 2
Commercial and Industrial [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 184 | $ 70
Percent of total loan class | 0.32% | 0.13%
Commercial and Industrial [Member] | Payment Deferral [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 184 | $ 70
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 270 | $ 94
Percent of total loan class | 1.07% | 0.35%
Commercial Real Estate [Member] | Payment Deferral [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 267 | $ 94
Commercial Real Estate [Member] | Combination of Modification Types [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | 3 |
Residential Builder and Developer [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 2 | $ 8
Percent of total loan class | 0.18% | 0.64%
Residential Builder and Developer [Member] | Payment Deferral [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 2 | $ 8
Other Commercial Construction [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 131 | $ 92
Percent of total loan class | 2.11% | 1.39%
Other Commercial Construction [Member] | Payment Deferral [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 131 | $ 92
Residential [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 49 | $ 35
Percent of total loan class | 0.22% | 0.15%
Residential [Member] | Payment Deferral [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 48 | $ 33
Residential [Member] | Combination of Modification Types [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | 1 | 2
Residential Limited Documentation [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 2 | $ 5
Percent of total loan class | 0.17% | 0.51%
Residential Limited Documentation [Member] | Payment Deferral [Member] |  |
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items] |  |
Financing receivable, modifications other than troubled debt restructuring | $ 2 | $ 5

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