v3.26.1
Loans and Related Allowance for Credit Losses, Commercial Loan Categories by Risk Categories and Vintage (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable and Net Investment in Lease, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Total loans $ 1,016,787 $ 913,842 $ 986,167
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]      
Net investment in lease, credit quality indicator, update frequency [Extensible Enumeration] Credit Quality Indicator, Updated Quarterly [Member]   Credit Quality Indicator, Updated Quarterly [Member]
Financing receivable, credit quality indicator, update frequency [Extensible Enumeration] Credit Quality Indicator, Updated Quarterly [Member]   Credit Quality Indicator, Updated Quarterly [Member]
Total Commercial [Member]      
Financing Receivable and Net Investment in Lease, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, total $ 48,624   $ 135,506
Term loans by origination year, fiscal year before current fiscal year, total 108,289   40,208
Term loans by origination year, two years before current fiscal year, total 37,475   25,878
Term loans by origination year, three years before current fiscal year, total 23,457   34,641
Term loans by origination year, four years before current fiscal year, total 32,993   23,207
Term loans by origination year, more than five years before current fiscal year, total 55,758   37,462
Revolving loans, total 323,000   302,925
Revolving loans converted to term loans, total 44   68
Total loans 629,640   599,895
Total Commercial [Member] | Pass [Member]      
Financing Receivable and Net Investment in Lease, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Total loans 598,100    
Total Commercial [Member] | Criticized [Member]      
Financing Receivable and Net Investment in Lease, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Total loans 31,600    
Total Commercial [Member] | Commercial and industrial loans [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 35,868   85,802
Term loans by origination year, fiscal year before current fiscal year, finance receivable 63,840   24,343
Term loans by origination year, two years before current fiscal year, finance receivable 22,780   12,878
Term loans by origination year, three years before current fiscal year, finance receivable 11,870   13,329
Term loans by origination year, four years before current fiscal year, finance receivable 13,449   7,511
Term loans by origination year, more than five years before current fiscal year, finance receivable 18,649   12,914
Revolving loans, finance receivable 315,441   295,278
Revolving loans converted to term loans, finance receivable 18   13
Total loans 481,915   452,068
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, charge-offs 4   54
Term loans by origination year, fiscal year before current fiscal year, charge-offs 12   56
Term loans by origination year, two years before current fiscal year, charge-offs 5   42
Term loans by origination year, three years before current fiscal year, charge-offs 8   26
Term loans by origination year, four years before current fiscal year, charge-offs 2   27
Term loans by origination year, more than five years before current fiscal year, charge-offs 3   14
Revolving loans, charge-offs 338   485
Revolving loans converted to term loans, charge-offs 0   0
Loan charge-offs, loans 372 148 704
Total Commercial [Member] | Commercial and industrial loans [Member] | Pass [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 35,490   84,419
Term loans by origination year, fiscal year before current fiscal year, finance receivable 62,435   23,611
Term loans by origination year, two years before current fiscal year, finance receivable 21,935   11,947
Term loans by origination year, three years before current fiscal year, finance receivable 10,943   12,544
Term loans by origination year, four years before current fiscal year, finance receivable 12,634   7,248
Term loans by origination year, more than five years before current fiscal year, finance receivable 18,012   12,455
Revolving loans, finance receivable 304,744   285,207
Revolving loans converted to term loans, finance receivable 18   13
Total loans 466,211   437,444
Total Commercial [Member] | Commercial and industrial loans [Member] | Criticized [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 378   1,383
Term loans by origination year, fiscal year before current fiscal year, finance receivable 1,405   732
Term loans by origination year, two years before current fiscal year, finance receivable 845   931
Term loans by origination year, three years before current fiscal year, finance receivable 927   785
Term loans by origination year, four years before current fiscal year, finance receivable 815   263
Term loans by origination year, more than five years before current fiscal year, finance receivable 637   459
Revolving loans, finance receivable 10,697   10,071
Revolving loans converted to term loans, finance receivable 0   0
Total loans 15,704   14,624
Total Commercial [Member] | Commercial real estate [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 11,602   44,737
Term loans by origination year, fiscal year before current fiscal year, finance receivable 39,684   12,201
Term loans by origination year, two years before current fiscal year, finance receivable 11,277   9,428
Term loans by origination year, three years before current fiscal year, finance receivable 8,324   19,642
Term loans by origination year, four years before current fiscal year, finance receivable 18,064   14,877
Term loans by origination year, more than five years before current fiscal year, finance receivable 35,677   23,697
Revolving loans, finance receivable 7,559   7,647
Revolving loans converted to term loans, finance receivable 26   55
Total loans 132,213   132,284
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, charge-offs 35   104
Term loans by origination year, fiscal year before current fiscal year, charge-offs 0   52
Term loans by origination year, two years before current fiscal year, charge-offs 0   38
Term loans by origination year, three years before current fiscal year, charge-offs 0   61
Term loans by origination year, four years before current fiscal year, charge-offs 39   117
Term loans by origination year, more than five years before current fiscal year, charge-offs 6   123
Revolving loans, charge-offs 0   2
Revolving loans converted to term loans, charge-offs 0   0
Loan charge-offs, loans 80 96 497
Total Commercial [Member] | Commercial real estate [Member] | Pass [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 10,535   40,934
Term loans by origination year, fiscal year before current fiscal year, finance receivable 36,592   10,799
Term loans by origination year, two years before current fiscal year, finance receivable 9,824   8,246
Term loans by origination year, three years before current fiscal year, finance receivable 7,478   16,051
Term loans by origination year, four years before current fiscal year, finance receivable 14,756   11,863
Term loans by origination year, more than five years before current fiscal year, finance receivable 31,008   21,690
Revolving loans, finance receivable 7,347   7,588
Revolving loans converted to term loans, finance receivable 26   55
Total loans 117,566   117,226
Total Commercial [Member] | Commercial real estate [Member] | Criticized [Member]      
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]      
Term loans by origination year, current fiscal year, finance receivable 1,067   3,803
Term loans by origination year, fiscal year before current fiscal year, finance receivable 3,092   1,402
Term loans by origination year, two years before current fiscal year, finance receivable 1,453   1,182
Term loans by origination year, three years before current fiscal year, finance receivable 846   3,591
Term loans by origination year, four years before current fiscal year, finance receivable 3,308   3,014
Term loans by origination year, more than five years before current fiscal year, finance receivable 4,669   2,007
Revolving loans, finance receivable 212   59
Revolving loans converted to term loans, finance receivable 0   0
Total loans 14,647   15,058
Total Commercial [Member] | Lease financing [Member]      
Net Investment in Lease, before Allowance for Credit Loss [Abstract]      
Term loans by origination year, current fiscal year, net investment in lease 1,154   4,967
Term loans by origination year, fiscal year before current fiscal year, net investment in lease 4,765   3,664
Term loans by origination year, two years before current fiscal year, net investment in lease 3,418   3,572
Term loans by origination year, three years before current fiscal year, net investment in lease 3,263   1,670
Term loans by origination year, four years before current fiscal year, net investment in lease 1,480   819
Term loans by origination year, more than five years before current fiscal year, net investment in lease 1,432   851
Revolving loans, net investment in lease 0   0
Revolving loans converted to term loans, net investment in lease 0   0
Lease financing 15,512   15,543
Net Investment in Lease, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]      
Net investment in lease by origination year, current fiscal year, charge-offs 0   3
Net investment in lease by origination year, year before current fiscal year, charge-offs 3   11
Net investment in lease by origination year, two years before current fiscal year, charge-offs 4   17
Net investment in lease by origination year, three years before current fiscal year, charge-offs 3   10
Net investment in lease by origination year, four years before current fiscal year, charge-offs 2   5
Net investment in lease by origination year, more than five years before current fiscal year, charge-offs 1   4
Net investment in lease, revolving loans, charge-offs 0   0
Net investment in lease, revolving loans converted to term loans, charge-offs 0   0
Loan charge-offs, lease financing 13 $ 11 50
Total Commercial [Member] | Lease financing [Member] | Pass [Member]      
Net Investment in Lease, before Allowance for Credit Loss [Abstract]      
Term loans by origination year, current fiscal year, net investment in lease 1,069   4,566
Term loans by origination year, fiscal year before current fiscal year, net investment in lease 4,369   3,295
Term loans by origination year, two years before current fiscal year, net investment in lease 3,099   3,254
Term loans by origination year, three years before current fiscal year, net investment in lease 3,002   1,524
Term loans by origination year, four years before current fiscal year, net investment in lease 1,360   768
Term loans by origination year, more than five years before current fiscal year, net investment in lease 1,376   812
Revolving loans, net investment in lease 0   0
Revolving loans converted to term loans, net investment in lease 0   0
Lease financing 14,275   14,219
Total Commercial [Member] | Lease financing [Member] | Criticized [Member]      
Net Investment in Lease, before Allowance for Credit Loss [Abstract]      
Term loans by origination year, current fiscal year, net investment in lease 85   401
Term loans by origination year, fiscal year before current fiscal year, net investment in lease 396   369
Term loans by origination year, two years before current fiscal year, net investment in lease 319   318
Term loans by origination year, three years before current fiscal year, net investment in lease 261   146
Term loans by origination year, four years before current fiscal year, net investment in lease 120   51
Term loans by origination year, more than five years before current fiscal year, net investment in lease 56   39
Revolving loans, net investment in lease 0   0
Revolving loans converted to term loans, net investment in lease 0   0
Lease financing $ 1,237   $ 1,324