Debt Obligations - Range of Interest Rates and Weighted Average Interest Rate Incurred on Variable Rate Debt Obligations (Details)	Mar. 31, 2022
TRGP Revolver [Member]
Debt Instrument [Line Items]
Weighted average interest rate incurred	1.60%
Targa Resources Partners LP [Member] | Securitization Facility [Member]
Debt Instrument [Line Items]
Weighted average interest rate incurred	1.20%
Minimum [Member] | TRGP Revolver [Member]
Debt Instrument [Line Items]
Range of interest rates incurred	1.50%
Minimum [Member] | Targa Resources Partners LP [Member] | Securitization Facility [Member]
Debt Instrument [Line Items]
Range of interest rates incurred	1.10%
Maximum [Member] | TRGP Revolver [Member]
Debt Instrument [Line Items]
Range of interest rates incurred	1.80%
Maximum [Member] | Targa Resources Partners LP [Member] | Securitization Facility [Member]
Debt Instrument [Line Items]
Range of interest rates incurred	1.20%