Loans and Related Allowance for Credit Losses, Unfunded Credit Commitments (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	$ 661,691	$ 666,735
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	453,266	461,279
Total Commercial [Member] \| Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	437,418	445,910
Total Commercial [Member] \| Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	15,848	15,369
Total Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	208,425	205,456
Total Consumer [Member] \| Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	17,527	17,496
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Financing receivable line of credit facility remaining borrowing capacity	13,500	15,200
Total Consumer [Member] \| Credit card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	183,990	180,563
Total Consumer [Member] \| Other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded credit commitments	6,908	7,397
International [Member] \| Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Letters of credit outstanding, amount	$ 1,100	$ 1,200

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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-Name Accounting Standards Codification
-Section 40
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
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+ References

No definition available.

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