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Debt Obligations - Summary Of Debt Obligations (Parenthetical) (Details) - USD ($)		1 Months Ended	9 Months Ended		12 Months Ended
	May 21, 2024	Aug. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Debt Instrument [Line Items]
Proceeds from borrowings under accounts receivable securitization facility			$ 775,000,000	$ 103,100,000
Loan repayment	$ 1,500,000,000
Gain (loss) due to debt extinguishments	$ (800,000)
Senior Unsecured 6.150% Fixed Rate, due March 2029 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt			6.15%		6.15%
Accounts Receivable Securitization Facility [Member]
Debt Instrument [Line Items]
Maturity date		Aug. 29, 2025
Proceeds from borrowings under accounts receivable securitization facility			$ 600,000,000
Remaining liquidity needs		$ 600,000,000	$ 0
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
Borrowings outstanding			$ 0
Revolving Credit Facility [Member] \| Commercial Paper Program [Member]
Debt Instrument [Line Items]
Borrowings outstanding			951,000,000
Revolving Credit Facility [Member] \| Letter of Credit [Member]
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Remaining liquidity needs			$ 1,800,000,000
Term Loan Facility, Variable Rate, due July 2025
Debt Instrument [Line Items]
Maturity date			Jul. 31, 2025		Jul. 31, 2025
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 6.150% Fixed Rate, due March 2029 [Member]
Debt Instrument [Line Items]
Maturity date			Mar. 31, 2029		Mar. 31, 2029
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%
Senior Unsecured Notes [Member] \| Senior Unsecured 6.125% Fixed Rate, due March 2033 [Member]
Debt Instrument [Line Items]
Maturity date			Mar. 31, 2033		Mar. 31, 2033
Interest rate on fixed rate debt			6.125%		6.125%
Senior Unsecured Notes [Member] \| Senior Unsecured 6.500% Fixed Rate, due March 2034 [Member]
Debt Instrument [Line Items]
Maturity date			Mar. 31, 2034		Mar. 31, 2034
Interest rate on fixed rate debt			6.50%		6.50%
Senior Unsecured Notes [Member] \| Senior Unsecured 5.500% Fixed Rate, due February 2035 [Member]
Debt Instrument [Line Items]
Maturity date			Feb. 28, 2035		Feb. 28, 2035
Interest rate on fixed rate debt		5.50%	5.50%		5.50%
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%
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 6.500% Fixed Rate, due February 2053 [Member]
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Maturity date			Feb. 28, 2053		Feb. 28, 2053
Interest rate on fixed rate debt			6.50%		6.50%
Targa Resources Partners LP [Member] \| Accounts Receivable Securitization Facility [Member] \| Accounts Receivable Securitization Facility, due August 2025 [Member]
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Maturity date			Aug. 31, 2025		Aug. 31, 2025
Targa Resources Partners LP [Member] \| Senior Unsecured Notes [Member] \| Senior Unsecured 6.500% Fixed Rate, due July 2027 [Member]
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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 5.000% 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 of 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 of 5.500% Senior 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 4.875% Senior Notes due February 2031 [Member]
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Maturity date			Feb. 28, 2031		Feb. 28, 2031
Interest rate on fixed rate debt			4.875%		4.875%
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%