v3.26.3
Debt Obligations - Summary Of Debt Obligations (Parenthetical) (Details) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2026
Mar. 31, 2026
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Jun. 30, 2026
Jan. 15, 2026
Debt Instrument [Line Items]              
Proceeds from borrowings under accounts receivable securitization facility     $ 1,200,000,000 $ 1,470,000,000      
Partnership accounts receivable securitization facility, due August 2025 [1]     $ 451,000,000   $ 0    
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]              
Borrowing capacity $ 800,000,000         $ 600,000,000  
Maturity date Jul. 30, 2027            
Proceeds from borrowings under accounts receivable securitization facility     $ 451,000,000        
Remaining liquidity needs     149,000,000        
Accounts Receivable Securitization Facility [Member] | Committed Line of Credit [Member]              
Debt Instrument [Line Items]              
Borrowing capacity $ 600,000,000   600,000,000        
Accounts Receivable Securitization Facility [Member] | Uncommitted Line of Credit [Member]              
Debt Instrument [Line Items]              
Borrowing capacity $ 200,000,000   $ 200,000,000        
Revolving Credit Facility [Member] | TRGP Senior Revolving Credit Facility due February 2030 [Member]              
Debt Instrument [Line Items]              
Maturity date     Feb. 28, 2030   Feb. 28, 2030    
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     900,000,000        
Aggregate principal amount issued     3,500,000,000        
Revolving Credit Facility [Member] | Letter of Credit [Member] | TRGP Senior Revolving Credit Facility due February 2030 [Member]              
Debt Instrument [Line Items]              
Remaining liquidity needs     $ 2,600,000,000        
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 4.350% Fixed Rate, due January 2029 [Member]              
Debt Instrument [Line Items]              
Maturity date     Jan. 29, 2029   Jan. 29, 2029    
Interest rate on fixed rate debt     4.35%   4.35%    
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 4.900% Fixed Rate, due September 2030 [Member]              
Debt Instrument [Line Items]              
Maturity date     Sep. 30, 2030   Sep. 30, 2030    
Interest rate on fixed rate debt     4.90%   4.90%    
Senior Unsecured Notes [Member] | Senior Unsecured 4.350% fixed rate, due April 2031 [Member]              
Debt Instrument [Line Items]              
Maturity date     Apr. 30, 2031   Apr. 30, 2031    
Interest rate on fixed rate debt     4.35%   4.35%    
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 5.550% Fixed Rate, due August 2035 [Member]              
Debt Instrument [Line Items]              
Maturity date     Aug. 31, 2035   Aug. 31, 2035    
Interest rate on fixed rate debt     5.55%   5.55%    
Senior Unsecured Notes [Member] | Senior Unsecured Notes Due February 2036 [Member]              
Debt Instrument [Line Items]              
Maturity date     Feb. 29, 2036   Feb. 29, 2036    
Interest rate on fixed rate debt     5.65%   5.65%    
Senior Unsecured Notes [Member] | Senior Unsecured Notes Due July 2036 [Member]              
Debt Instrument [Line Items]              
Maturity date     Jul. 31, 2036   Jul. 31, 2036    
Interest rate on fixed rate debt     5.40%   5.40%    
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     May 31, 2055   May 31, 2055    
Interest rate on fixed rate debt     6.125%   6.125%    
Senior Unsecured Notes [Member] | Senior Unsecured of 6.875% Senior Notes due January 2029 [Member]              
Debt Instrument [Line Items]              
Interest rate on fixed rate debt             6.875%
Senior Unsecured Notes [Member] | Senior Unsecured of 4.350% Senior Notes due 2031 [Member]              
Debt Instrument [Line Items]              
Interest rate on fixed rate debt   4.35%          
Aggregate principal amount issued   $ 750,000,000          
Senior Unsecured Notes [Member] | Senior Unsecured of 6.050% Senior Notes due 2056 [Member]              
Debt Instrument [Line Items]              
Interest rate on fixed rate debt   6.05%          
Aggregate principal amount issued   $ 750,000,000          
Net proceeds from private placement of notes   $ 1,483,200,000          
Targa Resources Partners LP [Member] | Accounts Receivable Securitization Facility [Member] | Accounts Receivable Securitization Facility, due July 2027 [Member]              
Debt Instrument [Line Items]              
Maturity date     Jul. 31, 2027   Jul. 31, 2027    
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 6.050% Fixed Rate, due May 2056 [Member]              
Debt Instrument [Line Items]              
Maturity date     May 31, 2056   May 31, 2056    
Interest rate on fixed rate debt     6.05%   6.05%    
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 September 30, 2026, the Partnership had $451.0 million outstanding, collateralized by the qualifying receivables pursuant to the amended Receivables Purchase Agreement dated July 1, 2026, under its accounts receivable securitization facility (the “Securitization Facility”), resulting in $149.0 million of remaining availability under the committed line of the facility. In addition to the committed capacity of $600.0 million, the Securitization Facility has an uncommitted line of capacity with potential capacity of up to $200.0 million.