Debt Obligations - Range of Interest Rates and Weighted Average Interest Rate Incurred on Variable Rate Debt Obligations (Details)	Jun. 30, 2020
TRC Revolver [Member]
Debt Instrument [Line Items]
Weighted average interest rate incurred	2.80%
TRP Revolver [Member]
Debt Instrument [Line Items]
Weighted average interest rate incurred	2.50%
Targa Resources Partners LP [Member] | Securitization Facility [Member]
Debt Instrument [Line Items]
Weighted average interest rate incurred	2.10%
Minimum [Member] | TRC Revolver [Member]
Debt Instrument [Line Items]
Range of interest rates incurred	1.90%
Minimum [Member] | TRP Revolver [Member]
Debt Instrument [Line Items]
Range of interest rates incurred	1.90%
Minimum [Member] | Targa Resources Partners LP [Member] | Securitization Facility [Member]
Debt Instrument [Line Items]
Range of interest rates incurred	1.50%
Maximum [Member] | TRC Revolver [Member]
Debt Instrument [Line Items]
Range of interest rates incurred	3.50%
Maximum [Member] | TRP Revolver [Member]
Debt Instrument [Line Items]
Range of interest rates incurred	6.00%
Maximum [Member] | Targa Resources Partners LP [Member] | Securitization Facility [Member]
Debt Instrument [Line Items]
Range of interest rates incurred	2.70%