Loans and Related Allowance for Credit Losses, Consumer Loan Modifications and Financial Effects (Details) - Total Consumer [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 818	$ 571	$ 764
Total modifications as a percentage of loan class	0.34%	0.23%	0.29%
Weighted average interest rate reduction	1.45%	1.70%	1.65%
Weighted average payments deferred (months)	8 months	6 months	5 months
Weighted average term extension (years)	10 years 7 months 6 days	10 years 9 months 18 days	9 years 9 months 18 days
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Weighted average principal deferred, term	24 years 6 months	24 years 7 months 6 days	25 years 4 months 24 days
Residential mortgage [Member] \| Trial modifications [Member]
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Loans modified balance end of period	$ 110	$ 98	$ 109
Residential mortgage [Member] \| Payment delay [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	601	363	472
Residential mortgage [Member] \| Term extension [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	31	35	67
Residential mortgage [Member] \| Term extension and payment delay [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	106	89	88
Residential mortgage [Member] \| Interest rate reduction, and term extension, and payment delay [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	48	45	80
Residential mortgage [Member] \| All other modifications and combinations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	32	39	57
Residential mortgage [Member] \| Payment delay with balloon payment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	368	344	292
Credit card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 935	$ 772	$ 459
Total modifications as a percentage of loan class	1.57%	1.37%	0.88%
Weighted average interest rate reduction	21.34%	22.04%	21.63%
Credit card [Member] \| Interest rate reduction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 935	$ 772	$ 459

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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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