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Investments in Unconsolidated Affiliates - Additional Information (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2020 JointVenture | Jan. 31, 2020 USD ($) | Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Sale price of equity-method investment | $ 73.8 |  |  |
Gain on sale of equity-method investment | $ 69.3 |  |  |
Business combination, contingent consideration, liability, current |  |  | $ 3.5 |
Targa Resources Partners LP [Member] | Gulf Coast Fractionators LP [Member] | Logistics and Transportation [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 38.80% |  |
Targa Resources Partners LP [Member] | T2 Joint Ventures [Member] | Gathering and Processing [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Number of operated joint ventures | JointVenture |  | 2 |  |
Targa Resources Partners LP [Member] | T2 LaSalle [Member] | Gathering and Processing [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 75.00% |  |
Targa Resources Partners LP [Member] | T2 Eagle Ford [Member] | Gathering and Processing [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 50.00% |  |
Targa Resources Partners LP [Member] | Cayenne Joint Venture [Member] | Gathering and Processing [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 50.00% |  |
Targa Resources Partners LP [Member] | GCX [Member] | Logistics and Transportation [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 25.00% |  |
Targa Resources Partners LP [Member] | Little Missouri 4 [Member] | Logistics and Transportation [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  | 50.00% |  |
Targa Resources Partners LP [Member] | T2 EF Cogen [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Ownership interest |  |  |  | 50.00%

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