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Mortgage Banking Activity - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Net loans and leases | $ 61,622 |  | $ 61,622 |  | $ 60,519
Mortgage banking income | 9 | $ 7 | 28 | $ 18 |
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 | $ 31 |  | $ 31 |  |

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