Loans and Related Allowance for Credit Losses, Consumer Loan Modifications and Financial Effects (Details) - Total Consumer [Member] - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 274	$ 357	$ 467	$ 531
Total modifications as a percentage of loan class	0.11%	0.15%	0.19%	0.22%
Weighted average interest rate reduction	1.08%	1.63%	1.27%	1.69%
Weighted average payments deferred (months)	3 months	4 months	5 months	4 months
Weighted average term extension (years)	10 years 2 months 12 days	10 years 10 months 24 days	11 years	11 years 2 months 12 days
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Weighted average principal deferred, term	24 years 9 months 18 days	24 years 3 months 18 days	25 years 3 months 18 days	24 years 6 months
Residential mortgage [Member] \| Trial modifications [Member]
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Loans modified balance end of period	$ 126	$ 127	$ 126	$ 127
Residential mortgage [Member] \| Payment delay [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	226	304	367	423
Residential mortgage [Member] \| Term extension and payment delay [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	25	23	53	48
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	14	14	28	26
Residential mortgage [Member] \| All other modifications and combinations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	9	16	19	34
Residential mortgage [Member] \| Payment delay with balloon payment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	75	89	156	183
Credit card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 257	$ 251	$ 516	$ 521
Total modifications as a percentage of loan class	0.44%	0.45%	0.88%	0.94%
Weighted average interest rate reduction	20.63%	21.50%	20.80%	21.49%
Credit card [Member] \| Interest rate reduction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 257	$ 251	$ 516	$ 521

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
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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