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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 | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | $ 642 | $ 592
Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 545 | 469
30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 22 | 47
90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 75 | 76
Commercial | Commercial and industrial loans |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 252 | 274
Commercial | Commercial and industrial loans | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 213 | 207
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 | 6 | 11
Commercial | Commercial and industrial loans | 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 33 | 56
Commercial | Commercial mortgage owner-occupied loans |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 90 | 37
Commercial | Commercial mortgage owner-occupied loans | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 66 | 21
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 | 16
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 | 24 | 0
Commercial | Commercial mortgage nonowner-occupied loans |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 72 | 53
Commercial | Commercial mortgage nonowner-occupied loans | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 72 | 50
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 | 3
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 | 108 | 74
Commercial | Commercial construction loans | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 107 | 74
Commercial | Commercial construction loans | 30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 1 | 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 | 81 | 110
Residential Mortgage | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 55 | 82
Residential Mortgage | 30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 11 | 12
Residential Mortgage | 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 15 | 16
Consumer | Home equity |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 15 | 15
Consumer | Home equity | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 13 | 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 | 20 | 24
Consumer | Credit card | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 15 | 17
Consumer | Credit card | 30-89 days past due |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 3 | 4
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 | 1 | 1
Consumer | Solar energy installation loans | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 1 | 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 | 3 | 4
Consumer | Other consumer loans | Current |  |
Financing Receivable, Recorded Investment, Past Due |  |
Financing receivable, excluding accrued interest, modified, after 12 months | 3 | 4
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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