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Mortgage Banking Activity - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net loans and leases $ 62,281   $ 62,281   $ 61,750
Mortgage banking income 15 $ 9 33 $ 28  
Sale of mortgage servicing rights 10        
Gain on sale of mortgage servicing rights 5        
Mortgage Banking          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Mortgage banking income     3 $ 3  
First Horizon Bank          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Net loans and leases $ 28   $ 28