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Credit Quality and the Allowance for Loan and Lease Losses - Summary of Loans That Were Modified for Borrowers Experiencing Financial Difficulty (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | $ 716 | $ 453
Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 619 | 394
30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 63 | 32
90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 34 | 27
Commercial | Commercial and industrial loans |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 246 | 219
Commercial | Commercial and industrial loans | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 226 | 196
Commercial | Commercial and industrial loans | 30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 2 | 13
Commercial | Commercial and industrial loans | 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 18 | 10
Commercial | Commercial mortgage owner-occupied loans |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 112 | 26
Commercial | Commercial mortgage owner-occupied loans | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 112 | 26
Commercial | Commercial mortgage owner-occupied loans | 30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 0 | 0
Commercial | Commercial mortgage owner-occupied loans | 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 0 | 0
Commercial | Commercial mortgage nonowner-occupied loans |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 117 | 67
Commercial | Commercial mortgage nonowner-occupied loans | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 117 | 67
Commercial | Commercial mortgage nonowner-occupied loans | 30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 0 | 0
Commercial | Commercial mortgage nonowner-occupied loans | 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 0 | 0
Commercial | Commercial construction loans |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 113 | 6
Commercial | Commercial construction loans | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 69 | 6
Commercial | Commercial construction loans | 30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 44 | 0
Commercial | Commercial construction loans | 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 0 | 0
Residential Mortgage |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 88 | 94
Residential Mortgage | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 62 | 66
Residential Mortgage | 30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 13 | 15
Residential Mortgage | 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 13 | 13
Consumer | Home equity |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 16 | 15
Consumer | Home equity | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 14 | 13
Consumer | Home equity | 30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 1 | 1
Consumer | Home equity | 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 1 | 1
Consumer | Credit card |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 18 | 22
Consumer | Credit card | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 13 | 16
Consumer | Credit card | 30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 3 | 3
Consumer | Credit card | 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 2 | 3
Consumer | Solar energy installation loans |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 2 | 1
Consumer | Solar energy installation loans | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 2 | 1
Consumer | Solar energy installation loans | 30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 0 | 0
Consumer | Solar energy installation loans | 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 0 | 0
Consumer | Other consumer loans |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 4 | 3
Consumer | Other consumer loans | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 4 | 3
Consumer | Other consumer loans | 30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 0 | 0
Consumer | Other consumer loans | 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | $ 0 | $ 0

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