Investments in Unconsolidated Affiliates - Additional Information (Details) - Targa Resources Partners LP [Member]	3 Months Ended
	Mar. 31, 2019 MMcf / d JointVenture mi
Gulf Coast Fractionators LP [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest	38.80%
T2 Joint Ventures [Member]
Schedule Of Equity Method Investments [Line Items]
Number of non-operated joint ventures | JointVenture	2
T2 LaSalle [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest	75.00%
T2 Eagle Ford [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest	50.00%
Cayenne Joint Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest	50.00%
Gas pipeline owns | mi	62
GCX [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest	25.00%
Little Missouri 4 [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest	50.00%
Processing capacity | MMcf / d	200
Agua Blanca [Member]
Schedule Of Equity Method Investments [Line Items]
Ownership interest	10.00%