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Term Borrowings - Schedule of Information Pertaining To Term Borrowings (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |
Term borrowings | $ 1,150 | $ 1,597
Junior Subordinated Debt |  |
Debt Instrument [Line Items] |  |
Debt term | 30 years |
First Horizon Bank | Senior Notes | Maturity date – May 1, 2030 - 5.75% |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 448 | $ 448
Stated interest rate | 5.75% | 5.75%
First Horizon Bank | Collateralized By Loans | 0.50% on December 31, 2022 and 0.50% on December 31, 2021 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 88 | $ 87
Effective interest rate | 5.95% | 5.07%
First Horizon Bank | Collateralized By Loans | Other collateralized borrowings - SBA loans |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 3 | $ 3
Debt, weighted average interest rate | 4.81% | 5.13%
First Horizon Corporation | Senior Notes | Maturity date – May 26, 2023 - 3.55% |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 0 | $ 450
Stated interest rate | 3.55% | 3.55%
First Horizon Corporation | Senior Notes | Maturity date – May 26, 2025 - 4.00% |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 349 | $ 349
Stated interest rate | 4.00% | 4.00%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - June 28, 2035 - 7.33% on December 31, 2023 and 6.45% on December 31, 2022 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 3 | $ 3
Stated interest rate | 7.33% | 6.45%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - December 15, 2035 - 7.02% on December 31, 2023 and 6.14% on December 31, 2022 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 18 | $ 18
Stated interest rate | 7.02% | 6.14%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - March 15, 2036 - 7.05% on December 31, 2023 and 6.17% on December 31, 2022 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 9 | $ 9
Stated interest rate | 7.05% | 6.17%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - March 15, 2036 - 7.19% on December 31, 2023 and 6.31% on December 31, 2022 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 12 | $ 12
Stated interest rate | 7.19% | 6.31%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - June 30, 2036 - 6.91% on December 31, 2023 and 6.05% on December 31, 2022 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 28 | $ 27
Stated interest rate | 6.91% | 6.05%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - July 7, 2036 - 7.21% on December 31, 2023 and 5.63% on December 31, 2022 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 19 | $ 18
Stated interest rate | 7.21% | 5.63%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - June 15, 2037 - 7.30% on December 31, 2023 and 6.42% on December 31, 2022 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 52 | $ 52
Stated interest rate | 7.30% | 6.42%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - September 6, 2037 - 7.05% on December 31, 2023 and 6.16% on December 31, 2022 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 9 | $ 9
Stated interest rate | 7.05% | 6.16%
First Horizon Corporation | Notes Payable, Other Payables | New Market Tax Credit Investments |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 65 | $ 66
FT Real Estate Securities Company, Inc. | Cumulative Preferred Stock | Maturity date – March 31, 2031 – 9.50% |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 47 | $ 46
Stated interest rate | 9.50% | 9.50%
Minimum | First Horizon Bank | Collateralized By Loans | Other collateralized borrowings - SBA loans |  |
Debt Instrument [Line Items] |  |
Debt term | 2 years |
Minimum | First Horizon Corporation | Notes Payable, Other Payables | New Market Tax Credit Investments |  |
Debt Instrument [Line Items] |  |
Debt term | 7 years |
Debt, weighted average interest rate | 0.93% |
Maximum | First Horizon Bank | Collateralized By Loans | Other collateralized borrowings - SBA loans |  |
Debt Instrument [Line Items] |  |
Debt term | 25 years |
Maximum | First Horizon Corporation | Notes Payable, Other Payables | New Market Tax Credit Investments |  |
Debt Instrument [Line Items] |  |
Debt term | 35 years |
Debt, weighted average interest rate | 4.95% |

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