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Debt Obligations - Summary Of Debt Obligations (Parenthetical) (Details) - USD ($)
 6 Months Ended 12 Months Ended
May 21, 2024
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Debt Instrument [Line Items]        
Proceeds from borrowings under accounts receivable securitization facility   $ 125,000,000 $ 51,000,000  
Partnership accounts receivable securitization facility, due August 2024 [1]   $ 550,000,000   $ 575,000,000
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%
Commercial Paper Program [Member]        
Debt Instrument [Line Items]        
Aggregate principal amount issued   $ 2,750,000,000    
Accounts Receivable Securitization Facility [Member]        
Debt Instrument [Line Items]        
Proceeds from borrowings under accounts receivable securitization facility   550,000,000    
Partnership accounts receivable securitization facility, due August 2024   600,000,000    
Remaining liquidity needs   $ 50,000,000    
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 liquidity needs   $ 0    
Revolving Credit Facility [Member] | Commercial Paper Program [Member]        
Debt Instrument [Line Items]        
Remaining liquidity needs   1,300,000,000    
Revolving Credit Facility [Member] | Letter of Credit [Member]        
Debt Instrument [Line Items]        
Remaining liquidity needs   $ 1,400,000,000    
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 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%
Targa Resources Partners LP [Member] | Accounts Receivable Securitization Facility [Member] | Accounts Receivable Securitization Facility, due August 2024 [Member]        
Debt Instrument [Line Items]        
Maturity date   Sep. 30, 2023   Sep. 30, 2023
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 June 30, 2024, the Partnership had $550.0 million of qualifying receivables under its $600.0 million accounts receivable securitization facility (the “Securitization Facility”), resulting in $50.0 million of availability.