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Regulatory Capital and Restrictions - Schedule of Actual Capital Amounts and Ratios (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
First Horizon Corporation    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total Capital, Actual Amount $ 7,935 $ 4,155
Total Capital, Actual Ratio 0.1257 0.1122
Tier 1 Capital, Actual Amount $ 6,782 $ 3,761
Tier 1 Capital, Actual Ratio 0.1074 0.1015
Common Equity Tier 1 Capital, Actual Amount $ 6,110 $ 3,409
Common Equity Tier 1 Capital, Actual Ratio 9.68% 9.20%
Leverage, Actual Amount $ 6,782 $ 3,761
Leverage, Actual Ratio 0.0824 0.0904
Total Capital, Capital Adequacy purposes, Amount $ 5,051 $ 2,964
Total Capital, Capital Adequacy Purposes, Ratio 0.0800 0.0800
Tier 1 Capital, Capital Adequacy Purposes, Amount $ 3,788 $ 2,223
Tier 1 Capital, Capital Adequacy Purposes, Ratio 0.0600 0.0600
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Amount $ 2,841 $ 1,667
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Ratio 4.50% 4.50%
Leverage, Capital Adequacy Purposes, Amount $ 3,294 $ 1,663
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 $ 7,819 $ 3,945
Total Capital, Actual Ratio 0.1252 0.1077
Tier 1 Capital, Actual Amount $ 6,825 $ 3,729
Tier 1 Capital, Actual Ratio 0.1093 0.1018
Common Equity Tier 1 Capital, Actual Amount $ 6,530 $ 3,434
Common Equity Tier 1 Capital, Actual Ratio 10.46% 9.38%
Leverage, Actual Amount $ 6,825 $ 3,729
Leverage, Actual Ratio 0.0836 0.0912
Total Capital, Capital Adequacy purposes, Amount $ 5,001 $ 2,930
Total Capital, Capital Adequacy Purposes, Ratio 0.0800 0.0800
Tier 1 Capital, Capital Adequacy Purposes, Amount $ 3,751 $ 2,198
Tier 1 Capital, Capital Adequacy Purposes, Ratio 0.0600 0.0600
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Amount $ 2,813 $ 1,648
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Ratio 4.50% 4.50%
Leverage, Capital Adequacy Purposes, Amount $ 3,268 $ 1,635
Leverage, Capital Adequacy purposes, Ratio 0.0400 0.0400
Total Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 6,251 $ 3,663
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 $ 5,001 $ 2,930
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 $ 4,063 $ 2,381
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 $ 4,085 $ 2,043
Leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.0500 0.0500