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Significant Group Concentrations of Credit Risk Significant Group Concentrations of Credit Risk (Commercial Real Estate Exposure) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 53,402 $ 49,285
Real estate construction loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 3,105 2,948
Commercial mortgage loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 13,306 11,255
Total commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 16,411 14,203
Total unused commitments 6,602 4,030
Commercial Real Estate business line | Real estate construction loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans [1] 2,505 2,391
Commercial Real Estate business line | Commercial mortgage loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans [1] 4,681 3,338
Other Business Lines Member | Real estate construction loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans [2] 600 557
Other Business Lines Member | Commercial mortgage loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans [2] $ 8,625 $ 7,917
[1] Primarily loans to real estate developers.
[2] Primarily loans secured by owner-occupied real estate.