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Loans and Related Allowance for Credit Losses, Commercial Loan Categories by Delinquency Status (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 1,016,787	$ 986,167	$ 913,842
Total nonaccrual loans	8,469	8,201
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	629,640	599,895
Total nonaccrual loans	5,513	5,266
Total Commercial [Member] \| Current-29 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	621,899	592,438
Total Commercial [Member] \| 30-89 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,617	1,820
Total Commercial [Member] \| 90 days or more past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	611	371
Total Commercial [Member] \| Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	481,915	452,068
Nonaccrual loans	1,646	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	479,085	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	978	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	206	120
Total Commercial [Member] \| Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	132,213	132,284
Nonaccrual loans	3,779	3,879
Total Commercial [Member] \| Commercial real estate [Member] \| Current-29 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	127,592	127,432
Total Commercial [Member] \| Commercial real estate [Member] \| 30-89 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	437	722
Total Commercial [Member] \| Commercial real estate [Member] \| 90 days or more past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	405	251
Total Commercial [Member] \| Lease financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	15,512	15,543
Nonaccrual lease financing	88	75
Total Commercial [Member] \| Lease financing [Member] \| Current-29 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	15,222	15,242
Total Commercial [Member] \| Lease financing [Member] \| 30-89 days past due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Lease financing	202	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