v3.26.1
Loans and Related Allowance for Credit Losses (Delinquency Status of Commerical FDMS) (Details) - Total commercial lending - USD ($)
$ in Millions
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis $ 3,175 $ 2,624
Current or Less Than 30 Days Past Due    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 2,710 1,974
30-59 Days Past Due    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 6 17
60-89 Days Past Due    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 13 0
90 Days or More Past Due    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 0 0
Nonperforming Loans    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 446 633
Commercial and industrial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 2,078 1,389
Commercial and industrial | Current or Less Than 30 Days Past Due    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 1,915 1,184
Commercial and industrial | 30-59 Days Past Due    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 6 16
Commercial and industrial | 60-89 Days Past Due    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 0 0
Commercial and industrial | 90 Days or More Past Due    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 0 0
Commercial and industrial | Nonperforming Loans    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 157 189
Commercial real estate    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 1,097 1,235
Commercial real estate | Current or Less Than 30 Days Past Due    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 795 790
Commercial real estate | 30-59 Days Past Due    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 0 1
Commercial real estate | 60-89 Days Past Due    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 13 0
Commercial real estate | 90 Days or More Past Due    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis 0 0
Commercial real estate | Nonperforming Loans    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Financing receivable, aging analysis $ 289 $ 444