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Mortgage Banking Activity - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net loans and leases $ 60,558   $ 60,558   $ 57,417
Mortgage banking and title income 6 $ 34 11 $ 56  
Mortgage banking and title income          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Mortgage banking and title income     2 $ 3  
Sale of mortgage servicing rights   21      
Gain on sale of mortgage servicing rights   $ 12      
First Horizon Bank          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net loans and leases $ 36   $ 36