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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, 2025 | Sep. 30, 2024
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | $ 487 | $ 576
Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 115 | 152
Investor Real Estate |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 135 | 264
Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 237 | 160
Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 331 | 328
Current | Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 80 | 104
Current | Investor Real Estate |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 82 | 103
Current | Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 169 | 121
Financial Asset, 30 to 89 Days Past Due |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 39 | 48
Financial Asset, 30 to 89 Days Past Due | Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 0
Financial Asset, 30 to 89 Days Past Due | Investor Real Estate |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 0 | 27
Financial Asset, 30 to 89 Days Past Due | Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 39 | 21
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 | 17 | 11
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial |  |
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 | Investor Real Estate |  |
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 |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 17 | 11
Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 100 | 189
Non-performing [Member] | Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 35 | 48
Non-performing [Member] | Investor Real Estate |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 53 | 134
Non-performing [Member] | Consumer |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 12 | 7
Commercial And Industrial [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 111 | 147
Commercial And Industrial [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 77 | 101
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 | 0
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 | 0
Commercial And Industrial [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 34 | 46
Commercial Real Estate Mortgage - Owner-Occupied [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 4 | 5
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 | 3
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 | 1 | 2
Commercial investor real estate mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 135 | 264
Commercial investor real estate mortgage [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 82 | 103
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 | 0 | 27
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 | 53 | 134
Residential First Mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 218 | 142
Residential First Mortgage [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 155 | 106
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 | 39 | 20
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 | 17 | 11
Residential First Mortgage [Member] | Non-performing [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 7 | 5
Home Equity Lines of Credit[Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 8 | 8
Home Equity Lines of Credit[Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 6 | 7
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 | 2 | 1
Home Equity Loan [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 11 | 10
Home Equity Loan [Member] | Current |  |
Financing Receivable, Modifications [Line Items] |  |
Modifications to Troubled Borrowers, modified in the previous 12-month period | 8 | 8
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 | 0 | 1
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 | $ 3 | $ 1

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