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Term Borrowings - Schedule of Information Pertaining To Term Borrowings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Term borrowings	$ 1,670	$ 791
Loans, net of unearned income	58,232	31,061
First Horizon Bank | Senior Notes | Maturity date – May 1, 2030 - 5.75% on December 31, 2020
Debt Instrument [Line Items]
Term borrowings	$ 447	0
Stated interest rate	5.75%
First Horizon Bank | Collateralized By Loans | 0.52% on December 31, 2020 and 2.19% on December 31, 2019 (b)
Debt Instrument [Line Items]
Term borrowings	$ 82	$ 81
Effective interest rate	0.52%	2.19%
First Horizon Bank | Collateralized By Loans | Other collateralized borrowings - SBA loans
Debt Instrument [Line Items]
Term borrowings	$ 15	$ 22
Debt, weighted average interest rate	3.90%	3.95%
First Horizon Corporation | Senior Notes | Maturity date – December 15, 2020 – 3.50% on December 31, 2019 (d)
Debt Instrument [Line Items]
Term borrowings	$ 0	$ 496
Stated interest rate		3.50%
First Horizon Corporation | Senior Notes | Maturity date – May 26, 2023 - 3.55% on December 31, 2020
Debt Instrument [Line Items]
Term borrowings	$ 447	$ 0
Stated interest rate	3.55%
First Horizon Corporation | Senior Notes | Maturity date – May 26, 2025 - 4.00% on December 31, 2020
Debt Instrument [Line Items]
Term borrowings	$ 348	0
Stated interest rate	4.00%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - June 28, 2035 - 1.90% on December 31, 2020 and 3.57% on December 31, 2019
Debt Instrument [Line Items]
Term borrowings	$ 3	$ 3
Stated interest rate	1.90%	3.57%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - December 15, 2035 - 1.59% on December 31, 2020 and 3.26% on December 31, 2019
Debt Instrument [Line Items]
Term borrowings	$ 18	$ 18
Stated interest rate	1.59%	3.26%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - March 15, 2036 - 1.62% on December 31, 2020 and 3.29% on December 31, 2019
Debt Instrument [Line Items]
Term borrowings	$ 9	$ 9
Stated interest rate	1.62%	3.29%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - March 15, 2036 - 1.76% on December 31, 2020 and 3.43% on December 31, 2019
Debt Instrument [Line Items]
Term borrowings	$ 12	$ 12
Stated interest rate	1.76%	3.43%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - June 30, 2036 - 1.56% on December 31, 2020 and 3.28% on December 31, 2019
Debt Instrument [Line Items]
Term borrowings	$ 27	$ 26
Stated interest rate	1.56%	3.28%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - July 7, 2036 - 1.79% on December 31, 2020 and 3.54% on December 31, 2019
Debt Instrument [Line Items]
Term borrowings	$ 18	$ 18
Stated interest rate	1.79%	3.54%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - June 15, 2037 - 1.87% on December 31, 2020 and 3.54% on December 31, 2019
Debt Instrument [Line Items]
Term borrowings	$ 51	$ 51
Stated interest rate	1.87%	3.54%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - September 6, 2037 - 1.66% on December 31, 2020 and 3.32% on December 31, 2019
Debt Instrument [Line Items]
Term borrowings	$ 9	$ 9
Stated interest rate	1.66%	3.32%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - July 31, 2031 - 3.51% on December 31, 2020
Debt Instrument [Line Items]
Term borrowings	$ 7	$ 0
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	$ 9	0
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	$ 5	0
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	$ 9	0
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	$ 6	0
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	$ 8	0
Stated interest rate	2.25%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - October 7, 2036 - 1.88% on December 31, 2020
Debt Instrument [Line Items]
Term borrowings	$ 6	0
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	$ 10	0
Stated interest rate	1.84%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - September 15, 2037 - 1.65% on December 31, 2020
Debt Instrument [Line Items]
Term borrowings	$ 7	0
Stated interest rate	1.65%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - December 15, 2037 - 2.97% on December 31, 2020
Debt Instrument [Line Items]
Term borrowings	$ 10	0
Stated interest rate	2.97%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - December 15, 2037 - 2.76% on December 31, 2020
Debt Instrument [Line Items]
Term borrowings	$ 10	0
Stated interest rate	2.76%
First Horizon Corporation | Junior Subordinated Debt | Maturity date - June 15, 2038 - 3.72% on December 31, 2020
Debt Instrument [Line Items]
Term borrowings	$ 6	0
Stated interest rate	3.72%
First Horizon Corporation | Notes Payable, Other Payables | New Market Tax Credit Investments
Debt Instrument [Line Items]
Term borrowings	$ 45	0
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	2 years
Minimum | First Horizon Corporation | Notes Payable, Other Payables | New Market Tax Credit Investments
Debt Instrument [Line Items]
Stated interest rate	1.27%
Debt term	7 years
Maximum | First Horizon Bank | Collateralized By Loans | Other collateralized borrowings - SBA loans
Debt Instrument [Line Items]
Debt term	24 years
Maximum | First Horizon Corporation | Notes Payable, Other Payables | New Market Tax Credit Investments
Debt Instrument [Line Items]
Stated interest rate	4.95%
Debt term	35 years

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