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Loans and Related Allowance for Credit Losses (Aging Analysis) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | $ 2,513 | $ 3,006
Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1,976 | 2,147
30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 8 | 24
60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 5
90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 6 | 7
Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 519 | 823
Commercial Portfolio Segment |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 2,268 | 2,816
Commercial Portfolio Segment | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1,924 | 2,087
Commercial Portfolio Segment | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 18
Commercial Portfolio Segment | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1 | 1
Commercial Portfolio Segment | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Commercial Portfolio Segment | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 339 | 710
Commercial Portfolio Segment | Commercial and industrial |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1,381 | 1,480
Commercial Portfolio Segment | Commercial and industrial | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1,261 | 1,213
Commercial Portfolio Segment | Commercial and industrial | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 3 | 18
Commercial Portfolio Segment | Commercial and industrial | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1 | 1
Commercial Portfolio Segment | Commercial and industrial | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Commercial Portfolio Segment | Commercial and industrial | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 116 | 248
Commercial Portfolio Segment | Commercial real estate |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 886 | 1,336
Commercial Portfolio Segment | Commercial real estate | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 662 | 874
Commercial Portfolio Segment | Commercial real estate | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1 | 0
Commercial Portfolio Segment | Commercial real estate | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Commercial Portfolio Segment | Commercial real estate | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Commercial Portfolio Segment | Commercial real estate | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 223 | 462
Commercial Portfolio Segment | Equipment lease financing |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1 |
Commercial Portfolio Segment | Equipment lease financing | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1 |
Commercial Portfolio Segment | Equipment lease financing | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 |
Commercial Portfolio Segment | Equipment lease financing | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 |
Commercial Portfolio Segment | Equipment lease financing | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 |
Commercial Portfolio Segment | Equipment lease financing | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 |
Consumer Portfolio Segment |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 245 | 190
Consumer Portfolio Segment | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 52 | 60
Consumer Portfolio Segment | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 6
Consumer Portfolio Segment | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 3 | 4
Consumer Portfolio Segment | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 6 | 7
Consumer Portfolio Segment | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 180 | 113
Consumer Portfolio Segment | Residential real estate |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 150 | 92
Consumer Portfolio Segment | Residential real estate | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 8
Consumer Portfolio Segment | Residential real estate | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 1
Consumer Portfolio Segment | Residential real estate | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Consumer Portfolio Segment | Residential real estate | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Consumer Portfolio Segment | Residential real estate | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 146 | 83
Consumer Portfolio Segment | Home equity |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 35 | 32
Consumer Portfolio Segment | Home equity | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 5
Consumer Portfolio Segment | Home equity | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Consumer Portfolio Segment | Home equity | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Consumer Portfolio Segment | Home equity | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Consumer Portfolio Segment | Home equity | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 31 | 27
Consumer Portfolio Segment | Credit card |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 52 | 60
Consumer Portfolio Segment | Credit card | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 38 | 43
Consumer Portfolio Segment | Credit card | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 5
Consumer Portfolio Segment | Credit card | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 3 | 4
Consumer Portfolio Segment | Credit card | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 6 | 7
Consumer Portfolio Segment | Credit card | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1 | 1
Consumer Portfolio Segment | Education |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 4
Consumer Portfolio Segment | Education | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 4
Consumer Portfolio Segment | Education | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Consumer Portfolio Segment | Education | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Consumer Portfolio Segment | Education | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Consumer Portfolio Segment | Education | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Consumer Portfolio Segment | Other consumer |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 2
Consumer Portfolio Segment | Other consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 2 | 0
Consumer Portfolio Segment | Other consumer | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Consumer Portfolio Segment | Other consumer | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Consumer Portfolio Segment | Other consumer | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 0 | 0
Consumer Portfolio Segment | Other consumer | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | $ 2 | $ 2

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