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Significant Group Concentrations of Credit Risk Significant Group Concentrations of Credit Risk (Schedule of Automotive Industry Outstanding Loans and Total Exposure) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Concentration Risk [Line Items]
Total automotive loans	$ 6,277	$ 7,039
Total automotive exposure	$ 10,336	12,162
Concentration Risk Threshold - Auto	12.00%
Automotive Production
Concentration Risk [Line Items]
Total automotive loans	$ 764	848
Total automotive exposure	1,661	1,744
Automotive Dealer
Concentration Risk [Line Items]
Total automotive loans	5,513	6,191
Total automotive exposure	$ 8,675	$ 10,418

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Concentration Risk Threshold - Auto

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- Definition

Total automotive exposure including loans and other credit commitments to automotive dealers and to borrowers involved with automotive production.

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Total automotive loans including loans to automotive dealers and to borrowers involved with automotive production.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478785/954-310-50-2

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