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Term Borrowings - Schedule of Information Pertaining To Term Borrowings (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Term borrowings | $ 1,590 | $ 1,670
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 | $ 447 | $ 447
Stated interest rate | 5.75% | 5.75%
First Horizon Bank | Collateralized By Loans | 0.50% on December 31, 2021 and 0.52% on December 31, 2020 (b) |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 87 | $ 82
Effective interest rate | 0.50% | 0.52%
First Horizon Bank | Collateralized By Loans | Other collateralized borrowings - SBA loans |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 6 | $ 15
Debt, weighted average interest rate | 4.10% | 3.90%
First Horizon Corporation | Senior Notes | Maturity date – May 26, 2023 - 3.55% |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 448 | $ 447
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 | $ 348
Stated interest rate | 4.00% | 4.00%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - July 31, 2031 - 3.51% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 0 | $ 7
Stated interest rate |  | 3.51%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - November 15, 2032 - 3.50% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | 0 | $ 9
Stated interest rate |  | 3.50%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - March 26, 2033 - 3.40% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | 0 | $ 5
Stated interest rate |  | 3.40%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - June 17, 2033 - 3.40% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | 0 | $ 9
Stated interest rate |  | 3.40%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - March 17, 2034 - 3.02% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | 0 | $ 6
Stated interest rate |  | 3.02%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - September 20, 2034 - 2.25% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | 0 | $ 8
Stated interest rate |  | 2.25%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - June 28, 2035 - 1.88% on December 31, 2021 and 1.90% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 3 | $ 3
Stated interest rate | 1.88% | 1.90%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - December 15, 2035 - 1.57% on December 31, 2021 and 1.59% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 18 | $ 18
Stated interest rate | 1.57% | 1.59%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - March 15, 2036 - 1.60% on December 31, 2021 and 1.62% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 9 | $ 9
Stated interest rate | 1.60% | 1.62%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - March 15, 2036 - 1.74% on December 31, 2021 and 1.76% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 12 | $ 12
Stated interest rate | 1.74% | 1.76%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - June 30, 2036 - 1.54% on December 31, 2021 and 1.56% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 27 | $ 27
Stated interest rate | 1.54% | 1.56%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - July 7, 2036 - 1.67% on December 31, 2021 and 1.79% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 18 | $ 18
Stated interest rate | 1.67% | 1.79%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - October 7, 2036 - 1.88% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 0 | $ 6
Stated interest rate |  | 1.88%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - December 30, 2036 - 1.84% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | 0 | $ 10
Stated interest rate |  | 1.84%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - June 15, 2037 - 1.85% on December 31, 2021 and 1.87% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 52 | $ 51
Stated interest rate | 1.85% | 1.87%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - September 6, 2037 - 1.61% on December 31, 2021 and 1.66% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 9 | $ 9
Stated interest rate | 1.61% | 1.66%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - September 15, 2037 - 1.65% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 0 | $ 7
Stated interest rate |  | 1.65%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - December 15, 2037 - 2.76% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | 0 | $ 10
Stated interest rate |  | 2.76%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - December 15, 2037 - 2.97% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | 0 | $ 10
Stated interest rate |  | 2.97%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - June 15, 2038 - 3.72% on December 31, 2020 |  |
Debt Instrument [Line Items] |  |
Term borrowings | 0 | $ 6
Stated interest rate |  | 3.72%
First Horizon Corporation | Notes Payable, Other Payables | New Market Tax Credit Investments |  |
Debt Instrument [Line Items] |  |
Term borrowings | 59 | $ 45
FT Real Estate Securities Company, Inc. | Cumulative Preferred Stock | Maturity date – March 31, 2031 – 9.50% |  |
Debt Instrument [Line Items] |  |
Term borrowings | $ 46 | $ 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 | 4 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% | 1.27%
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% | 4.95%

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