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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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Amortized cost excluding accrued interest, of financing receivable 12 months after modification for debtor experiencing financial difficulty.

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