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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, 2022	Dec. 31, 2021
Concentration Risk [Line Items]
Total automotive loans	$ 6,435	$ 5,274
Total automotive exposure	12,938	12,706
Automotive Production
Concentration Risk [Line Items]
Total automotive loans	1,068	1,112	[1]
Total automotive exposure	2,028	2,041	[1]
Automotive Dealer
Concentration Risk [Line Items]
Total automotive loans	5,367	4,162
Total automotive exposure	$ 10,910	$ 10,665
[1] Excludes PPP loans

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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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- Definition

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.

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