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Regulatory Capital and Restrictions - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) financialSubsidiary | Dec. 31, 2020 USD ($) | Jan. 01, 2022 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Retained earnings | $ 2,891 | $ 2,261 |
Dividend paid to parent company | $ 770 | 180 |
Number of financial subsidiaries with covered transactions | financialSubsidiary | 2 |  |
First Horizon Bank |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Retained earnings | $ 2,200 |  |
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 | $ 812 |  |
Covered transactions | $ 1 |  |
Percent of capital stock and surplus threshold for credit extension to affiliates | 20.00% |  |
Maximum amount of credit bank may extend to all affiliates | $ 1,600 |  |
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 | 400 |  |
First Horizon Advisors, Inc. |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Covered transactions | 51 |  |
All Affiliates Member |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Covered transactions | 453 |  |
Minimum | First Horizon Bank |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Vault cash included in cash reserves | $ 464 | $ 397 |
Subsequent Event | First Horizon Bank |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Positive (negative) amount available for dividend payments |  |  | $ 1,100

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