Loans and Related Allowance for Credit Losses, Commercial Loan Modifications and Financial Effects (Details) - Total Commercial [Member] - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Commercial and industrial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 516	$ 502
Total modifications as a percentage of loan class	0.11%	0.13%
Weighted average term extension (months)	14 months	18 months
Commercial and industrial loans [Member] \| Term extension [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 441	$ 392
Commercial and industrial loans [Member] \| All other modifications and combinations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	75	110
Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 243	$ 735
Total modifications as a percentage of loan class	0.18%	0.55%
Weighted average term extension (months)	23 months	21 months
Commercial real estate [Member] \| Term extension [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 242	$ 726
Commercial real estate [Member] \| All other modifications and combinations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 1	$ 9

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
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

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