Debt Obligations - Summary Of Debt Obligations (Parenthetical) (Details) - USD ($)		3 Months Ended	6 Months Ended
		Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Proceeds from borrowings under accounts receivable securitization facility			$ 226,400,000	$ 742,900,000
Accounts receivable securitization facility	[1],[2]	$ 250,000,000.0	250,000,000.0			$ 370,000,000.0
Accounts Receivable Securitization Facility [Member]
Debt Instrument [Line Items]
Maturity date		Apr. 21, 2021
Proceeds from borrowings under accounts receivable securitization facility			250,000,000.0
Accounts receivable securitization facility		$ 250,000,000.0	250,000,000.0
Remaining borrowing capacity		0	0
Maximum borrowing capacity		250,000,000.0	$ 250,000,000.0		$ 400,000,000.0
Revolving Credit Facility [Member] | TRC Senior Secured Revolving Credit Facility due June 2023 [Member]
Debt Instrument [Line Items]
Maturity date			Jun. 30, 2023
Remaining borrowing capacity		235,000,000.0	$ 235,000,000.0
Maximum borrowing capacity		$ 670,000,000.0	$ 670,000,000.0
Senior Unsecured Notes [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 4 3/4% Notes due November 2021 [Member]
Debt Instrument [Line Items]
Maturity date			Nov. 30, 2021
Interest rate on fixed rate debt		4.75%	4.75%
Senior Unsecured Notes [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 5 7/8% Notes due August 2023 [Member]
Debt Instrument [Line Items]
Maturity date			Aug. 31, 2023
Interest rate on fixed rate debt		5.875%	5.875%
Targa Resources Partners LP [Member] | Accounts Receivable Securitization Facility [Member] | Accounts Receivable Securitization Facility Due December 2020 [Member]
Debt Instrument [Line Items]
Maturity date			Apr. 30, 2021
Targa Resources Partners LP [Member] | Revolving Credit Facility [Member] | TRP Senior Secured Revolving Credit Facility due June 2023 [Member]
Debt Instrument [Line Items]
Maturity date			Jun. 30, 2023
Remaining borrowing capacity		$ 1,703,200,000	$ 1,703,200,000
Maximum borrowing capacity		$ 2,200,000,000	$ 2,200,000,000
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5 7/8% Notes due April 2026 [Member]
Debt Instrument [Line Items]
Maturity date			Apr. 30, 2026
Interest rate on fixed rate debt		5.875%	5.875%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5 1/4% Notes due May 2023 [Member]
Debt Instrument [Line Items]
Maturity date			May 31, 2023
Interest rate on fixed rate debt		5.25%	5.25%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5% Notes due January 2028 [Member]
Debt Instrument [Line Items]
Maturity date			Jan. 31, 2028
Interest rate on fixed rate debt		5.00%	5.00%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 4 1/4% Notes due November 2023 [Member]
Debt Instrument [Line Items]
Maturity date			Nov. 30, 2023
Interest rate on fixed rate debt		4.25%	4.25%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 6½% Senior Notes due July 2027 [Member]
Debt Instrument [Line Items]
Maturity date			Jul. 31, 2027
Interest rate on fixed rate debt		6.50%	6.50%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 6 3/4% Notes due March 2024 [Member]
Debt Instrument [Line Items]
Maturity date			Mar. 31, 2024
Interest rate on fixed rate debt		6.75%	6.75%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5 1/8% Notes due February 2025 [Member]
Debt Instrument [Line Items]
Maturity date			Feb. 28, 2025
Interest rate on fixed rate debt		5.125%	5.125%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured of 6⅞% Senior Notes due January 2029 [Member]
Debt Instrument [Line Items]
Maturity date			Jan. 31, 2029
Interest rate on fixed rate debt		6.875%	6.875%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5 3/8% Notes due February 2027 [Member]
Debt Instrument [Line Items]
Maturity date			Feb. 28, 2027
Interest rate on fixed rate debt		5.375%	5.375%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured of 5½% Senior Notes due March 2030 [Member]
Debt Instrument [Line Items]
Maturity date			Mar. 31, 2030
Interest rate on fixed rate debt		5.50%	5.50%

[1] As of June 30, 2020, the Partnership had $250.0 million of qualifying receivables under its $250.0 million accounts receivable securitization facility (“Securitization Facility”), resulting in zero availability. During the second quarter of 2020, the Partnership amended the Securitization Facility to decrease the facility size from $400.0 million to $250.0 million to more closely align with our expectations for borrowing needs given commodity prices and to extend the facility termination date to April 21, 2021.

[2] While we consolidate the debt of the Partnership in our financial statements, we do not have the obligation to make interest payments or debt payments with respect to the debt of the Partnership.