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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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- Definition

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

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