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Loans and Related Allowance for Credit Losses, Commercial Loan Categories by Delinquency Status (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,031,115	$ 986,167	$ 924,418
Total nonaccrual loans	7,643	8,201
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	636,299	599,895
Total nonaccrual loans	4,735	5,266
Total Commercial [Member] \| Current-29 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	629,662	592,438
Total Commercial [Member] \| 30-89 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,225	1,820
Total Commercial [Member] \| 90 days or more past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	677	371
Total Commercial [Member] \| Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	487,630	452,068
Nonaccrual loans	1,248	1,312
Total Commercial [Member] \| Commercial and industrial loans [Member] \| Current-29 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	485,499	449,764
Total Commercial [Member] \| Commercial and industrial loans [Member] \| 30-89 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	694	872
Total Commercial [Member] \| Commercial and industrial loans [Member] \| 90 days or more past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	189	120
Total Commercial [Member] \| Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	132,986	132,284
Nonaccrual loans	3,402	3,879
Total Commercial [Member] \| Commercial real estate [Member] \| Current-29 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	128,789	127,432
Total Commercial [Member] \| Commercial real estate [Member] \| 30-89 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	307	722
Total Commercial [Member] \| Commercial real estate [Member] \| 90 days or more past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	488	251
Total Commercial [Member] \| Lease financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	15,683	15,543
Nonaccrual lease financing	85	75
Total Commercial [Member] \| Lease financing [Member] \| Current-29 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	15,374	15,242
Total Commercial [Member] \| Lease financing [Member] \| 30-89 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	224	226
Total Commercial [Member] \| Lease financing [Member] \| 90 days or more past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	$ 0	$ 0