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Regulatory Capital and Restrictions - Schedule of Actual Capital Amounts and Ratios (Details) $ in Millions | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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First Horizon Corporation |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Total Capital, Actual Amount | $ 9,222 | $ 7,918
Total Capital, Actual Ratio | 0.1333 | 0.1234
Tier 1 Capital, Actual Amount | $ 8,247 | $ 7,088
Tier 1 Capital, Actual Ratio | 0.1192 | 0.1104
Common Equity Tier 1 Capital, Actual Amount | $ 7,032 | $ 6,367
Common Equity Tier 1 Capital, Actual Ratio | 10.17% | 9.92%
Leverage, Actual Amount | $ 8,247 | $ 7,088
Leverage, Actual Ratio | 0.1036 | 0.0808
Total Capital, Capital Adequacy purposes, Amount | $ 5,533 | $ 5,135
Total Capital, Capital Adequacy Purposes, Ratio | 0.0800 | 0.0800
Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 4,150 | $ 3,851
Tier 1 Capital, Capital Adequacy Purposes, Ratio | 0.0600 | 0.0600
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 3,112 | $ 2,888
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, Capital Adequacy Purposes, Amount | $ 3,183 | $ 3,507
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 | $ 8,532 | $ 7,893
Total Capital, Actual Ratio | 0.1241 | 0.1241
Tier 1 Capital, Actual Amount | $ 7,700 | $ 7,133
Tier 1 Capital, Actual Ratio | 0.1120 | 0.1122
Common Equity Tier 1 Capital, Actual Amount | $ 7,405 | $ 6,838
Common Equity Tier 1 Capital, Actual Ratio | 10.77% | 10.75%
Leverage, Actual Amount | $ 7,700 | $ 7,133
Leverage, Actual Ratio | 0.0976 | 0.0820
Total Capital, Capital Adequacy purposes, Amount | $ 5,498 | $ 5,088
Total Capital, Capital Adequacy Purposes, Ratio | 0.0800 | 0.0800
Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 4,124 | $ 3,816
Tier 1 Capital, Capital Adequacy Purposes, Ratio | 0.0600 | 0.0600
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Amount | $ 3,093 | $ 2,862
Common Equity Tier 1 Capital, Capital Adequacy Purposes, Ratio | 4.50% | 4.50%
Leverage, Capital Adequacy Purposes, Amount | $ 3,157 | $ 3,478
Leverage, Capital Adequacy Purposes, Ratio | 0.0400 | 0.0400
Total Capital, To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount | $ 6,873 | $ 6,360
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 | $ 5,498 | $ 5,088
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 | $ 4,467 | $ 4,134
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 | $ 3,946 | $ 4,348
Leverage, To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio | 0.0500 | 0.0500

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