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Loans And The Allowance For Credit Losses(Aging and Non-Accrual Performance for Modifications to Troubled Borrowers (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | $ 576 | $ 703
Commercial Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 152 | 462
Total Investor Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 264 | 153
Consumer Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 160 | 88
Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 328 | 375
Current | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 104 | 262
Current | Total Investor Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 103 | 42
Current | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 121 | 71
Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 48 | 60
Financial Asset, 30 to 89 Days Past Due | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 2
Financial Asset, 30 to 89 Days Past Due | Total Investor Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 27 | 48
Financial Asset, 30 to 89 Days Past Due | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 21 | 10
Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 11 | 8
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 5
Financial Asset, Equal to or Greater than 90 Days Past Due | Total Investor Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 11 | 3
Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 189 | 260
Non-performing [Member] | Commercial Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 48 | 193
Non-performing [Member] | Total Investor Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 134 | 63
Non-performing [Member] | Consumer Portfolio Segment [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 7 | 4
Commercial And Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 147 | 451
Commercial And Industrial [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 101 | 258
Commercial And Industrial [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 2
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 5
Commercial And Industrial [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 46 | 186
Commercial Real Estate Mortgage - Owner-Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 5 | 9
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 3 | 4
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 0
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 0
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 2 | 5
Commercial Real Estate Construction - Owner-Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period |  | 2
Commercial Real Estate Construction - Owner-Occupied [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period |  | 0
Commercial Real Estate Construction - Owner-Occupied [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period |  | 0
Commercial Real Estate Construction - Owner-Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period |  | 0
Commercial Real Estate Construction - Owner-Occupied [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period |  | 2
Commercial investor real estate mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 264 | 151
Commercial investor real estate mortgage [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 103 | 40
Commercial investor real estate mortgage [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 27 | 48
Commercial investor real estate mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 0
Commercial investor real estate mortgage [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 134 | 63
Commercial Investor Real Estate Construction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period |  | 2
Commercial Investor Real Estate Construction [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period |  | 2
Commercial Investor Real Estate Construction [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period |  | 0
Commercial Investor Real Estate Construction [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period |  | 0
Commercial Investor Real Estate Construction [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period |  | 0
Residential First Mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 142 | 78
Residential First Mortgage [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 106 | 63
Residential First Mortgage [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 20 | 10
Residential First Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 11 | 3
Residential First Mortgage [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 5 | 2
Home Equity Lines of Credit[Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 8 | 3
Home Equity Lines of Credit[Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 7 | 3
Home Equity Lines of Credit[Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 0
Home Equity Lines of Credit[Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 0
Home Equity Lines of Credit[Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 1 | 0
Home Equity Loan [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 10 | 7
Home Equity Loan [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 8 | 5
Home Equity Loan [Member] | Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 1 | 0
Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 0
Home Equity Loan [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | $ 1 | $ 2

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