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Debt Obligations - Senior Unsecured Notes Issuances - Additional Information (Details) - Senior Unsecured Notes [Member] - USD ($) $ in Millions	1 Months Ended					12 Months Ended
	Feb. 28, 2021	Aug. 31, 2020	Nov. 30, 2019	Jan. 31, 2019	Apr. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Sep. 01, 2020
Senior Unsecured 5⅞% Notes due April 2026 [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued					$ 1,000.0
Interest rate on fixed rate debt					5.875%
Maturity date					Apr. 30, 2026
Net proceeds from private placement of notes					$ 991.9
Senior Unsecured 5⅞% Notes due April 2026 [Member] | Targa Resources Partners LP [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt						5.875%	5.875%
Maturity date						Apr. 30, 2026	Apr. 30, 2026
Senior Unsecured 6½% Senior Notes due July 2027 [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued				$ 750.0
Interest rate on fixed rate debt				6.50%
Maturity date				Jul. 31, 2027
Net proceeds from private placement of notes				$ 1,486.6
Senior Unsecured 6½% Senior Notes due July 2027 [Member] | Targa Resources Partners LP [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt						6.50%	6.50%
Maturity date						Jul. 31, 2027	Jul. 31, 2027
Senior Unsecured of 6⅞% Senior Notes due January 2029 [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued				$ 750.0
Interest rate on fixed rate debt				6.875%
Maturity date				Jan. 31, 2029
Senior Unsecured of 6⅞% Senior Notes due January 2029 [Member] | Targa Resources Partners LP [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt						6.875%	6.875%
Maturity date						Jan. 31, 2029	Jan. 31, 2029
Senior Unsecured 4 1/8% notes due November 2019 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt				4.125%
Senior Unsecured of 5½% Senior Notes due March 2030 [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued			$ 1,000.0
Interest rate on fixed rate debt			5.50%
Maturity date			Mar. 31, 2030
Net proceeds from private placement of notes			$ 990.8
Senior Unsecured of 5½% Senior Notes due March 2030 [Member] | Targa Resources Partners LP [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt						5.50%	5.50%
Maturity date						Mar. 31, 2030	Mar. 31, 2030
Senior Unsecured 4⅞% Notes due February 2031 [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued		$ 1,000.0
Interest rate on fixed rate debt		4.875%
Net proceeds from private placement of notes		$ 991.0
Senior Unsecured 4⅞% Notes due February 2031 [Member] | Targa Resources Partners LP [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt						4.875%	4.875%
Maturity date						Feb. 28, 2031	Feb. 28, 2031
Senior Unsecured 6¾% Notes due March 2024 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt		6.75%						6.75%
Senior Unsecured 6¾% Notes due March 2024 [Member] | Targa Resources Partners LP [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt						6.75%	6.75%
Maturity date						Mar. 31, 2024	Mar. 31, 2024
Senior Unsecured of 4% Senior Notes due 2032 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued	$ 1,000.0
Interest rate on fixed rate debt	4.00%
Net proceeds from private placement of notes	$ 992.0
Senior Unsecured 5⅛% Notes due 2025 [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt	5.125%
Senior Unsecured 4 3/4% Notes due November 2021 [Member] | Targa Resources Partners LP [Member] | Targa Pipeline Partners LP [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt						4.75%	4.75%
Maturity date						Nov. 30, 2021	Nov. 30, 2021
Senior Unsecured 4 3/4% Notes due November 2021 [Member] | Targa Resources Partners LP [Member] | Targa Pipeline Partners LP [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt	4.75%
Senior Unsecured 5 7/8% Notes due August 2023 [Member] | Targa Resources Partners LP [Member] | Targa Pipeline Partners LP [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt						5.875%	5.875%
Maturity date						Aug. 31, 2023	Aug. 31, 2023
Senior Unsecured 5 7/8% Notes due August 2023 [Member] | Targa Resources Partners LP [Member] | Targa Pipeline Partners LP [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt	5.875%

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