First Trust Natural Gas ETF Investment Objectives and Goals - First Trust Natural Gas ETF |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | <span style="color:#000000;font-family:Arial;font-size:12.60pt;font-weight:bold;">First Trust Natural Gas ETF (FCG)</span> |
| Objective [Heading] | <span style="color:#000000;font-family:Arial;font-size:9.90pt;font-weight:bold;">Investment Objective</span> |
| Objective, Primary [Text Block] | The First Trust Natural Gas ETF (the “Fund”) seeks investment results that correspond generally to the price and yield (before the Fund’s fees and expenses) of an equity index called the Nasdaq FactSet Natural GasTM Index (the “Index”). |