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Mortgage Banking Activity - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net loans and leases $ 61,018   $ 61,018   $ 57,417
Mortgage banking and title income 7 $ 9 18 $ 65  
Mortgage banking and title income          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Mortgage banking and title income     3 $ 4  
First Horizon Bank          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net loans and leases $ 35   $ 35