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Debt Obligations - Summary Of Debt Obligations (Parenthetical) (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Debt Instrument [Line Items]      
Proceeds from borrowings under accounts receivable securitization facility $ 440,000,000 $ 281,600,000  
Accounts receivable securitization facility [1],[2] 290,000,000   $ 350,000,000
Accounts Receivable Securitization Facility [Member]      
Debt Instrument [Line Items]      
Proceeds from borrowings under accounts receivable securitization facility 350,000,000    
Accounts receivable securitization facility 350,000,000    
Remaining borrowing capacity $ 60,000,000    
Revolving Credit Facility [Member] | TRC Senior Secured Revolving Credit Facility due June 2023 [Member]      
Debt Instrument [Line Items]      
Maturity date Jun. 01, 2023    
Remaining borrowing capacity $ 235,000,000    
Maximum borrowing capacity $ 670,000,000    
Senior Unsecured Notes [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 4 3/4% Notes due November 2021 [Member]      
Debt Instrument [Line Items]      
Maturity date Nov. 15, 2021    
Interest rate on fixed rate debt 4.75%    
Senior Unsecured Notes [Member] | Targa Pipeline Partners LP [Member] | Senior Unsecured 5 7/8% Notes due August 2023 [Member]      
Debt Instrument [Line Items]      
Maturity date Aug. 01, 2023    
Interest rate on fixed rate debt 5.875%    
Targa Resources Partners LP [Member] | Accounts Receivable Securitization Facility [Member] | Accounts Receivable Securitization Facility Due December 2018 [Member]      
Debt Instrument [Line Items]      
Maturity date Dec. 31, 2018    
Targa Resources Partners LP [Member] | Revolving Credit Facility [Member] | TRP Senior Secured Revolving Credit Facility due June 2023 [Member]      
Debt Instrument [Line Items]      
Maturity date Jun. 01, 2023    
Remaining borrowing capacity $ 2,123,400,000    
Maximum borrowing capacity $ 2,200,000,000    
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 4 1/8% notes due November 2019 [Member]      
Debt Instrument [Line Items]      
Maturity date Nov. 15, 2019    
Interest rate on fixed rate debt 4.125%    
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5 7/8% Notes due April 2026 [Member]      
Debt Instrument [Line Items]      
Maturity date Apr. 30, 2026    
Interest rate on fixed rate debt 5.875%    
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5 1/4% Notes due May 2023 [Member]      
Debt Instrument [Line Items]      
Maturity date May 01, 2023    
Interest rate on fixed rate debt 5.25%    
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5% Notes due January 2028 [Member]      
Debt Instrument [Line Items]      
Maturity date Jan. 31, 2028    
Interest rate on fixed rate debt 5.00%    
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 4 1/4% Notes due November 2023 [Member]      
Debt Instrument [Line Items]      
Maturity date Nov. 15, 2023    
Interest rate on fixed rate debt 4.25%    
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 6 3/4% Notes due March 2024 [Member]      
Debt Instrument [Line Items]      
Maturity date Mar. 15, 2024    
Interest rate on fixed rate debt 6.75%    
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5 1/8% Notes due February 2025 [Member]      
Debt Instrument [Line Items]      
Maturity date Feb. 28, 2025    
Interest rate on fixed rate debt 5.125%    
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5 3/8% Notes due February 2027 [Member]      
Debt Instrument [Line Items]      
Maturity date Feb. 28, 2027    
Interest rate on fixed rate debt 5.375%    
[1] As of September 30, 2018, the Partnership had $350.0 million of qualifying receivables under its $350.0 million accounts receivable securitization facility, resulting in availability of $60.0 million.
[2] While we consolidate the debt of the Partnership in our financial statements, we do not have the obligation to make interest payments or debt payments with respect to the debt of the Partnership.