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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, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans $ 49,285 $ 52,291
Real estate construction loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 2,948 4,082
Commercial mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 11,255 9,912
Total commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans 14,203 13,994
Total unused commitments 4,030 3,272
Commercial Real Estate business line | Real estate construction loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans [1] 2,391 3,657
Commercial Real Estate business line | Commercial mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans [1] 3,338 2,273
Other Business Lines Member | Real estate construction loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans [2] 557 425
Other Business Lines Member | Commercial mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total loans [2] $ 7,917 $ 7,639
[1] Primarily loans to real estate developers.
[2] Primarily loans secured by owner-occupied real estate.