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Credit Quality and the Allowance for Loan and Lease Losses - Summary of Commercial Loans That Were Modified for Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified in period, amount | $ 737 | $ 377 | $ 1,100 | $ 526
Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 1,184 | 678 | 1,184 | 678
Financing receivable, excluding accrued interest, modified in period, amount | 720 | 333 | 1,009 | 455
Commercial | Commercial and industrial loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 834 | 386 | 834 | 386
Financing receivable, excluding accrued interest, modified in period, amount | 525 | 243 | 775 | 283
Commercial | Commercial mortgage owner-occupied loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 84 | 123 | 84 | 123
Financing receivable, excluding accrued interest, modified in period, amount | 79 | 49 | 82 | 77
Commercial | Commercial mortgage nonowner-occupied loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 169 | 51 | 169 | 51
Financing receivable, excluding accrued interest, modified in period, amount | 83 | 0 | 85 | 2
Commercial | Commercial construction loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 97 | 118 | 97 | 118
Financing receivable, excluding accrued interest, modified in period, amount | 33 | 41 | 67 | 93
Commercial | Current |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 1,149 | 590 | 1,149 | 590
Commercial | Current | Commercial and industrial loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 801 | 321 | 801 | 321
Commercial | Current | Commercial mortgage owner-occupied loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 84 | 100 | 84 | 100
Commercial | Current | Commercial mortgage nonowner-occupied loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 167 | 51 | 167 | 51
Commercial | Current | Commercial construction loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 97 | 118 | 97 | 118
Commercial | 30-89 days past due |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 26 | 3 | 26 | 3
Commercial | 30-89 days past due | Commercial and industrial loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 24 | 3 | 24 | 3
Commercial | 30-89 days past due | Commercial mortgage owner-occupied loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 0 | 0 | 0 | 0
Commercial | 30-89 days past due | Commercial mortgage nonowner-occupied loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 2 | 0 | 2 | 0
Commercial | 30-89 days past due | Commercial construction loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 0 | 0 | 0 | 0
Commercial | 90 Days or More |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 9 | 85 | 9 | 85
Commercial | 90 Days or More | Commercial and industrial loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 9 | 62 | 9 | 62
Commercial | 90 Days or More | Commercial mortgage owner-occupied loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 0 | 23 | 0 | 23
Commercial | 90 Days or More | Commercial mortgage nonowner-occupied loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 0 | 0 | 0 | 0
Commercial | 90 Days or More | Commercial construction loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due |  |  |  |
Financing receivable, excluding accrued interest, modified, after 12 months | $ 0 | $ 0 | $ 0 | $ 0

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