Debt Obligations - Summary Of Debt Obligations (Parenthetical) (Details) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended
		Feb. 28, 2025	Mar. 31, 2025	Mar. 31, 2024	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Proceeds from borrowings under accounts receivable securitization facility			$ 870,000,000	$ 25,000,000
Partnership accounts receivable securitization facility, due August 2025	[1]		$ 600,000,000			$ 330,000,000
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]
Proceeds from borrowings under accounts receivable securitization facility			$ 600,000,000
Partnership accounts receivable securitization facility, due August 2025			600,000,000
Remaining liquidity needs			$ 0
Revolving Credit Facility [Member] | TRGP Senior Revolving Credit Facility due February 2030 [Member]
Debt Instrument [Line Items]
Maturity date			Feb. 28, 2027			Feb. 28, 2027
Borrowings outstanding			$ 0
Line of credit facility, current borrowing capacity		$ 3,500,000,000
Revolving Credit Facility [Member] | Commercial Paper Program [Member]
Debt Instrument [Line Items]
Borrowings outstanding			920,000,000
Aggregate principal amount issued			3,500,000,000
Revolving Credit Facility [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Remaining liquidity needs			$ 2,600,000,000
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Net proceeds from private placement of notes		$ 2,000,000,000
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%
Senior Unsecured Notes [Member] | Senior Unsecured 5.500% Fixed Rate, due August 2035 [Member]
Debt Instrument [Line Items]
Maturity date			Feb. 28, 2035			Feb. 28, 2035
Interest rate on fixed rate debt			5.55%			5.55%
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]
Debt Instrument [Line Items]
Maturity date			Feb. 28, 2053			Feb. 28, 2053
Interest rate on fixed rate debt			6.50%			6.50%
Senior Unsecured Notes [Member] | Senior Unsecured 6.125% Fixed Rate, due May 2055 [Member]
Debt Instrument [Line Items]
Maturity date			Feb. 28, 2053			Feb. 28, 2053
Interest rate on fixed rate debt			6.125%			6.125%
Senior Unsecured Notes [Member] | Senior Unsecured of 5.550% Senior Notes due 2035 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt		5.55%
Aggregate principal amount issued		$ 1,000,000,000
Senior Unsecured Notes [Member] | Senior Unsecured of 6.125% Senior Notes due 2055 [Member]
Debt Instrument [Line Items]
Interest rate on fixed rate debt		6.125%
Aggregate principal amount issued		$ 1,000,000,000
Senior Unsecured Notes [Member] | Senior Unsecured of Notes due February 2025 [Member]
Debt Instrument [Line Items]
Net proceeds from private placement of notes		$ 2,000,000,000
Targa Resources Partners LP [Member] | Accounts Receivable Securitization Facility [Member] | Accounts Receivable Securitization Facility, due August 2025 [Member]
Debt Instrument [Line Items]
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]
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 5.000% 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]
Debt Instrument [Line Items]
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%

[1] As of March 31, 2025, the Partnership had $600.0 million of qualifying receivables under its $600.0 million accounts receivable securitization facility (the “Securitization Facility”), resulting in no remaining availability.