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Loans and Related Allowance for Credit Losses (Aging Analysis) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Financing Receivable [Line Items]    
Financing receivable, aging analysis $ 2,513 $ 3,006
Current or Less Than 30 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 1,976 2,147
30-59 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 8 24
60-89 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 4 5
90 Days or More Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 6 7
Nonperforming Loans    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 519 823
Commercial Portfolio Segment    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 2,268 2,816
Commercial Portfolio Segment | Current or Less Than 30 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 1,924 2,087
Commercial Portfolio Segment | 30-59 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 4 18
Commercial Portfolio Segment | 60-89 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 1 1
Commercial Portfolio Segment | 90 Days or More Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Commercial Portfolio Segment | Nonperforming Loans    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 339 710
Commercial Portfolio Segment | Commercial and industrial    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 1,381 1,480
Commercial Portfolio Segment | Commercial and industrial | Current or Less Than 30 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 1,261 1,213
Commercial Portfolio Segment | Commercial and industrial | 30-59 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 3 18
Commercial Portfolio Segment | Commercial and industrial | 60-89 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 1 1
Commercial Portfolio Segment | Commercial and industrial | 90 Days or More Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Commercial Portfolio Segment | Commercial and industrial | Nonperforming Loans    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 116 248
Commercial Portfolio Segment | Commercial real estate    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 886 1,336
Commercial Portfolio Segment | Commercial real estate | Current or Less Than 30 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 662 874
Commercial Portfolio Segment | Commercial real estate | 30-59 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 1 0
Commercial Portfolio Segment | Commercial real estate | 60-89 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Commercial Portfolio Segment | Commercial real estate | 90 Days or More Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Commercial Portfolio Segment | Commercial real estate | Nonperforming Loans    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 223 462
Commercial Portfolio Segment | Equipment lease financing    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 1  
Commercial Portfolio Segment | Equipment lease financing | Current or Less Than 30 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 1  
Commercial Portfolio Segment | Equipment lease financing | 30-59 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0  
Commercial Portfolio Segment | Equipment lease financing | 60-89 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0  
Commercial Portfolio Segment | Equipment lease financing | 90 Days or More Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0  
Commercial Portfolio Segment | Equipment lease financing | Nonperforming Loans    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0  
Consumer Portfolio Segment    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 245 190
Consumer Portfolio Segment | Current or Less Than 30 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 52 60
Consumer Portfolio Segment | 30-59 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 4 6
Consumer Portfolio Segment | 60-89 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 3 4
Consumer Portfolio Segment | 90 Days or More Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 6 7
Consumer Portfolio Segment | Nonperforming Loans    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 180 113
Consumer Portfolio Segment | Residential real estate    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 150 92
Consumer Portfolio Segment | Residential real estate | Current or Less Than 30 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 4 8
Consumer Portfolio Segment | Residential real estate | 30-59 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 1
Consumer Portfolio Segment | Residential real estate | 60-89 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Consumer Portfolio Segment | Residential real estate | 90 Days or More Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Consumer Portfolio Segment | Residential real estate | Nonperforming Loans    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 146 83
Consumer Portfolio Segment | Home equity    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 35 32
Consumer Portfolio Segment | Home equity | Current or Less Than 30 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 4 5
Consumer Portfolio Segment | Home equity | 30-59 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Consumer Portfolio Segment | Home equity | 60-89 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Consumer Portfolio Segment | Home equity | 90 Days or More Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Consumer Portfolio Segment | Home equity | Nonperforming Loans    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 31 27
Consumer Portfolio Segment | Credit card    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 52 60
Consumer Portfolio Segment | Credit card | Current or Less Than 30 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 38 43
Consumer Portfolio Segment | Credit card | 30-59 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 4 5
Consumer Portfolio Segment | Credit card | 60-89 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 3 4
Consumer Portfolio Segment | Credit card | 90 Days or More Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 6 7
Consumer Portfolio Segment | Credit card | Nonperforming Loans    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 1 1
Consumer Portfolio Segment | Education    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 4 4
Consumer Portfolio Segment | Education | Current or Less Than 30 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 4 4
Consumer Portfolio Segment | Education | 30-59 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Consumer Portfolio Segment | Education | 60-89 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Consumer Portfolio Segment | Education | 90 Days or More Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Consumer Portfolio Segment | Education | Nonperforming Loans    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Consumer Portfolio Segment | Other consumer    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 4 2
Consumer Portfolio Segment | Other consumer | Current or Less Than 30 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 2 0
Consumer Portfolio Segment | Other consumer | 30-59 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Consumer Portfolio Segment | Other consumer | 60-89 Days Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Consumer Portfolio Segment | Other consumer | 90 Days or More Past Due    
Financing Receivable [Line Items]    
Financing receivable, aging analysis 0 0
Consumer Portfolio Segment | Other consumer | Nonperforming Loans    
Financing Receivable [Line Items]    
Financing receivable, aging analysis $ 2 $ 2