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Loans and Related Allowance for Credit Losses (Aging Analysis) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | $ 3,006 | $ 1,946
Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 2,147 | 1,595
30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 24 | 5
60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 5 | 3
90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 7 | 9
Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 823 | 334
Total commercial |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 2,816 | 1,782
Total commercial | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 2,087 | 1,556
Total commercial | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 18 |
Total commercial | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1 |
Total commercial | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis |  | 3
Total commercial | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 710 | 223
Total commercial | Commercial and industrial |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1,480 | 960
Total commercial | Commercial and industrial | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1,213 | 801
Total commercial | Commercial and industrial | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 18 |
Total commercial | Commercial and industrial | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1 |
Total commercial | Commercial and industrial | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis |  | 3
Total commercial | Commercial and industrial | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 248 | 156
Total commercial | Commercial real estate |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1,336 | 822
Total commercial | Commercial real estate | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 874 | 755
Total commercial | Commercial real estate | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 462 | 67
Total consumer |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 190 | 164
Total consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 60 | 39
Total consumer | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 6 | 5
Total consumer | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 3
Total consumer | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 7 | 6
Total consumer | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 113 | 111
Total consumer | Residential real estate |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 92 | 93
Total consumer | Residential real estate | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 8 | 4
Total consumer | Residential real estate | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1 | 1
Total consumer | Residential real estate | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis |  |
Total consumer | Residential real estate | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis |  |
Total consumer | Residential real estate | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 83 | 88
Total consumer | Home equity |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 32 | 22
Total consumer | Home equity | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 5 | 1
Total consumer | Home equity | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis |  |
Total consumer | Home equity | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 27 | 21
Total consumer | Credit card |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 60 | 45
Total consumer | Credit card | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 43 | 31
Total consumer | Credit card | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 5 | 4
Total consumer | Credit card | 60-89 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 3
Total consumer | Credit card | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 7 | 6
Total consumer | Credit card | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 1 | 1
Total consumer | Education |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 3
Total consumer | Education | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 4 | 3
Total consumer | Education | 30-59 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis |  |
Total consumer | Education | 90 Days or More Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis |  |
Total consumer | Other consumer |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | 2 | 1
Total consumer | Other consumer | Current or Less Than 30 Days Past Due |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis |  |
Total consumer | Other consumer | Nonperforming Loans |  |
Financing Receivable [Line Items] |  |
Financing receivable, aging analysis | $ 2 | $ 1

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