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Mortgage Banking Activity - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net loans and leases $ 58,330   $ 57,417
Mortgage banking and title income 5 $ 22  
Mortgage banking and title income      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Mortgage banking and title income 1 $ 2  
First Horizon Bank      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net loans and leases $ 38