Loans and Related Allowance for Credit Losses, Consumer Loan Modifications and Financial Effects (Details) - Total Consumer [Member] - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 282	$ 195
Total modifications as a percentage of loan class	0.12%	0.08%
Weighted average interest rate reduction	1.44%	1.78%
Weighted average payments deferred (months)	3 months	4 months
Weighted average term extension (years)	11 years 8 months 12 days	11 years 6 months
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Weighted average principal deferred, term	25 years 10 months 24 days	25 years
Residential mortgage [Member] \| Trial modifications [Member]
Accounts, Notes, Loans and Financing Receivable Textual [Abstract]
Loans modified balance end of period	$ 114	$ 111
Residential mortgage [Member] \| Payment delay [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	229	140
Residential mortgage [Member] \| Term extension and payment delay [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	28	25
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	15	12
Residential mortgage [Member] \| All other modifications and combinations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	10	18
Residential mortgage [Member] \| Payment delay with balloon payment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	83	94
Credit card [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 300	$ 309
Total modifications as a percentage of loan class	0.52%	0.57%
Weighted average interest rate reduction	21.01%	21.54%
Credit card [Member] \| Interest rate reduction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified during the period	$ 300	$ 309

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/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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-Section 50
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