Debt Obligations - Summary Of Debt Obligations (Parenthetical) (Details) - USD ($) $ in Millions		1 Months Ended	9 Months Ended		12 Months Ended
		Mar. 31, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Sep. 29, 2022	Apr. 30, 2022
Debt Instrument [Line Items]
Proceeds from borrowings under accounts receivable securitization facility			$ 1,180.0	$ 570.0
Partnership accounts receivable securitization facility, due September 2023	[1]		$ 750.0		$ 150.0
Accounts Receivable Securitization Facility [Member]
Debt Instrument [Line Items]
Maturity date			Sep. 01, 2023
Proceeds from borrowings under accounts receivable securitization facility			$ 750.0
Partnership accounts receivable securitization facility, due September 2023			800.0
Remaining borrowing capacity			50.0
Maximum borrowing capacity			$ 800.0			$ 400.0
Term Loan Facility, Variable Rate, due July 2025
Debt Instrument [Line Items]
Maturity date			Jul. 31, 2025		Jul. 31, 2025
Revolving Credit Facility [Member] | TRGP Senior Revolving Credit Facility due February 2027 [Member]
Debt Instrument [Line Items]
Maturity date			Feb. 28, 2027		Feb. 28, 2027
Remaining borrowing capacity			$ 550.0
Revolving Credit Facility [Member] | Commercial Paper Program [Member]
Debt Instrument [Line Items]
Remaining borrowing capacity			632.0
Revolving Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Remaining borrowing capacity			$ 1,500.0
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt							4.20%
Senior Unsecured Notes [Member] | Senior Unsecured 4.200% Notes due February 2033 [Member]
Debt Instrument [Line Items]
Maturity date			Feb. 28, 2033		Feb. 28, 2023
Interest rate on fixed rate debt			4.20%		4.20%		4.20%
Senior Unsecured Notes [Member] | Senior Unsecured 5.200% fixed rate, due July 2027 [Member]
Debt Instrument [Line Items]
Maturity date			Jul. 31, 2027		Jul. 31, 2027
Interest rate on fixed rate debt			5.20%		5.20%
Senior Unsecured Notes [Member] | Senior Unsecured 4.950% Notes due April 2052 [Member]
Debt Instrument [Line Items]
Maturity date			Apr. 30, 2052		Apr. 30, 2052
Interest rate on fixed rate debt			4.95%		4.95%		4.95%
Senior Unsecured Notes [Member] | Senior Unsecured 6.250% fixed rate, due July 2052 [Member]
Debt Instrument [Line Items]
Maturity date			Jul. 31, 2052		Jul. 31, 2052
Interest rate on fixed rate debt			6.25%		6.25%
Senior Unsecured Notes [Member] | Senior Unsecured 5.875% Notes due April 2026 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt							5.875%
Senior Unsecured Notes [Member] | Senior Unsecured 5.375% Notes due February 2027 [Member]
Debt Instrument [Line Items]
Maturity date		Mar. 31, 2022
Interest rate on fixed rate debt		5.375%
Senior Unsecured Notes [Member] | Accounts Receivable Securitization Facility [Member]
Debt Instrument [Line Items]
Maturity date			Sep. 01, 2023
Maximum borrowing capacity			$ 800.0			$ 400.0
Targa Resources Partners LP [Member] | Accounts Receivable Securitization Facility [Member] | Accounts Receivable Securitization Facility, due September 2023 [Member]
Debt Instrument [Line Items]
Maturity date			Sep. 30, 2023		Sep. 30, 2023
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5.200% fixed rate, due July 2027 [Member]
Debt Instrument [Line Items]
Maturity date			Jul. 31, 2027		Jul. 31, 2027
Interest rate on fixed rate debt			6.50%		6.50%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5.875% Notes due April 2026 [Member]
Debt Instrument [Line Items]
Maturity date			Apr. 30, 2026		Apr. 30, 2026
Interest rate on fixed rate debt			5.875%		5.875%		5.875%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5.000% Notes due January 2028 [Member]
Debt Instrument [Line Items]
Maturity date			Jan. 31, 2028		Jan. 31, 2028
Interest rate on fixed rate debt			5.00%		5.00%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 6.875% Senior Notes due January 2029 [Member]
Debt Instrument [Line Items]
Maturity date			Jan. 31, 2029		Jan. 31, 2029
Interest rate on fixed rate debt			6.875%		6.875%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5.375% Notes due February 2027 [Member]
Debt Instrument [Line Items]
Maturity date			Feb. 28, 2027		Feb. 28, 2027
Interest rate on fixed rate debt		5.375%	5.375%		5.375%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5.500% Notes due March 2030 [Member]
Debt Instrument [Line Items]
Maturity date			Mar. 31, 2030		Mar. 31, 2030
Interest rate on fixed rate debt			5.50%		5.50%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured of 4.000% Senior Notes due January 2032 [Member]
Debt Instrument [Line Items]
Maturity date			Jan. 31, 2032		Jan. 31, 2032
Interest rate on fixed rate debt			4.00%		4.00%
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured of 4.875% Senior Notes due February 2031 [Member]
Debt Instrument [Line Items]
Maturity date			Feb. 28, 2031		Feb. 28, 2031
Interest rate on fixed rate debt			4.875%		4.875%

[1] In September 2022, the Partnership amended the Securitization Facility to, among other things, increase the facility size from $400.0 million to $800.0 million and extend the facility termination date to September 1, 2023. As of September 30, 2022, the Partnership had $750.0 million of qualifying receivables under its $800.0 million accounts receivable securitization facility (the “Securitization Facility”), resulting in $50.0 million of availability.