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Regulatory Capital and Restrictions - Schedule of Actual Capital Amounts and Ratios (Details) $ in Millions | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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First Horizon Corporation |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital, Actual Amount | $ 7,918 | $ 7,935
Total Capital, Actual Ratio | 0.1234 | 0.1257
Tier 1 Capital, Actual Amount | $ 7,088 | $ 6,782
Tier 1 Capital, Actual Ratio | 0.1104 | 0.1074
Common Equity Tier 1 Capital, Actual Amount | $ 6,367 | $ 6,110
Common Equity Tier 1 Capital, Actual Ratio | 9.92% | 9.68%
Leverage, Actual Amount | $ 7,088 | $ 6,782
Leverage, Actual Ratio | 0.0808 | 0.0824
Total Capital, Capital Adequacy purposes, Amount | $ 5,135 | $ 5,051
Total Capital, Capital Adequacy Purposes, Ratio | 0.0800 | 0.0800
Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 3,851 | $ 3,788
Tier 1 Capital, Capital Adequacy Purposes, Ratio | 0.0600 | 0.0600
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 2,888 | $ 2,841
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, Capital Adequacy Purposes, Amount | $ 3,507 | $ 3,294
Leverage, Capital Adequacy Purposes, Ratio | 0.0400 | 0.0400
First Horizon Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital, Actual Amount | $ 7,893 | $ 7,827
Total Capital, Actual Ratio | 0.1241 | 0.1252
Tier 1 Capital, Actual Amount | $ 7,133 | $ 6,832
Tier 1 Capital, Actual Ratio | 0.1122 | 0.1093
Common Equity Tier 1 Capital, Actual Amount | $ 6,838 | $ 6,537
Common Equity Tier 1 Capital, Actual Ratio | 10.75% | 10.46%
Leverage, Actual Amount | $ 7,133 | $ 6,832
Leverage, Actual Ratio | 0.0820 | 0.0836
Total Capital, Capital Adequacy purposes, Amount | $ 5,088 | $ 5,001
Total Capital, Capital Adequacy Purposes, Ratio | 0.0800 | 0.0800
Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 3,816 | $ 3,751
Tier 1 Capital, Capital Adequacy Purposes, Ratio | 0.0600 | 0.0600
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 2,862 | $ 2,813
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, Capital Adequacy Purposes, Amount | $ 3,478 | $ 3,268
Leverage, Capital Adequacy Purposes, Ratio | 0.0400 | 0.0400
Total Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 6,360 | $ 6,251
Total Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.1000 | 0.1000
Tier 1 Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 5,088 | $ 5,001
Tier 1 Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.0800 | 0.0800
Common Equity Tier 1 Capital. To Be Well Capitalized Under Prompt Corrective Action, Amount | $ 4,134 | $ 4,063
Common Equity Tier 1 Capital. To Be Well Capitalized Under Prompt Corrective Action, Ratio | 6.50% | 6.50%
Leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 4,348 | $ 4,085
Leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.0500 | 0.0500

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