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Significant Group Concentrations of Credit Risk Significant Group Concentrations of Credit Risk (Commercial Real Estate Exposure) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 52,113 $ 53,402  
Loans, average $ 53,903 50,460 $ 49,083
Concentration risk threshold - Auto 14.00%    
Real estate construction loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 5,083 3,105  
Commercial mortgage loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 13,686 13,306  
Total commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 18,769 16,411  
Total unused commitments 4,382 6,602  
Commercial Real Estate business line | Real estate construction loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 4,570 2,505  
Commercial Real Estate business line | Commercial mortgage loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 4,727 4,681  
Other Business Lines Member | Real estate construction loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 513 600  
Other Business Lines Member | Commercial mortgage loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 8,959 $ 8,625