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Regulatory Capital and Restrictions - Narrative (Details) $ in Millions | 12 Months Ended |
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Dec. 31, 2023 USD ($) financialSubsidiary | Dec. 31, 2022 USD ($) | Jan. 01, 2024 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Retained earnings | $ 3,964 | $ 3,430 |
Dividend paid to parent company | $ 220 | $ 435 |
Number of financial subsidiaries with covered transactions | financialSubsidiary | 2 |  |
First Horizon Bank |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Retained earnings | $ 3,300 |  |
Percent of capital stock and surplus threshold for credit extension to parent and certain financial subsidiaries | 10.00% |  |
Maximum amount of credit bank may extend to parent and certain financial institutions | $ 951 |  |
Percent of capital stock and surplus threshold for credit extension to affiliates | 20.00% |  |
Maximum amount of credit bank may extend to all affiliates | $ 1,900 |  |
First Horizon Bank | Subsequent Event |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Amount available for dividend payments |  |  | $ 1,200
First Horizon Parent Company |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Covered transactions | 1 |  |
840 Denning LLC |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Covered transactions | 2 |  |
FHN Financial Securities Corp. |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Covered transactions | 387 |  |
First Horizon Advisors, Inc. |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Covered transactions | 50 |  |
All Affiliates Member |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Covered transactions | $ 438 |  |

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