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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, 2023 | Dec. 31, 2022
--- | --- | ---
Concentration Risk [Line Items] |  |
Total automotive loans | $ 7,039 | $ 6,435
Total automotive exposure | $ 12,162 | 12,938
Concentration risk threshold - Commercial Real Estate | 36.00% |
Automotive Production |  |
Concentration Risk [Line Items] |  |
Total automotive exposure | $ 1,744 | 2,028
Automotive Dealer |  |
Concentration Risk [Line Items] |  |
Total automotive loans | 6,191 | 5,367
Total automotive exposure | $ 10,418 | $ 10,910

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- Definition Total automotive exposure including loans and other credit commitments to automotive dealers and to borrowers involved with automotive production. + References No definition available. + Details
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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//1943274/2147481027/954-310-50-2 + Details
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