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Credit Quality and the Allowance for Loan and Lease Losses - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Mortgage loans in process of foreclosure amount | $ 100 |  | $ 100 |  | $ 94
Financing receivable, excluding accrued interest, modified in period, amount | $ 349 | $ 184 | $ 609 | $ 373 |
Loan modification program, percentage of modifications to total portfolio | 0.28% | 0.16% | 0.49% | 0.32% |
Loan modification program, loans excluded from modification program | $ 18 | $ 19 | $ 42 | $ 42 |
Unfunded commitment amounts | 106 |  | 106 |  | $ 88
Commercial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 308 | $ 150 | $ 507 | $ 268 |
Loan modification program, percentage of modifications to total portfolio | 0.43% | 0.22% | 0.71% | 0.39% |
Commercial | Minimum |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Term extension period |  |  | 3 months |  |
Commercial | Maximum |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Term extension period |  |  | 12 months |  |
Residential Mortgage |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 29 | $ 22 | $ 72 | $ 74 |
Loan modification program, percentage of modifications to total portfolio | 0.16% | 0.13% | 0.41% | 0.43% |
Modification program option, mortgage term |  |  | 480 months |  |
Modification program option, in-process modifications | $ 3 | $ 4 | $ 3 | $ 4 |
Residential Mortgage | Minimum |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Modification program option, mortgage interest payment deferral, term |  |  | 6 months |  |
Residential Mortgage | Maximum |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Modification program option, mortgage interest payment deferral, term |  |  | 12 months |  |
Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 12 | $ 12 | $ 30 | $ 31 |
Loan modification program, percentage of modifications to total portfolio | 0.04% | 0.04% | 0.10% | 0.11% |
Consumer | Home equity |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 5 | $ 4 | $ 11 | $ 11 |
Loan modification program, percentage of modifications to total portfolio | 0.11% | 0.10% | 0.24% | 0.27% |
Modification program option, mortgage term |  |  | 360 months |  |

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