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Debt Obligations - Summary Of Debt Obligations (Parenthetical) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2019
Jan. 31, 2019
Apr. 30, 2018
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nov. 30, 2020
Sep. 01, 2020
Aug. 31, 2020
Mar. 31, 2020
Debt Instrument [Line Items]                      
Proceeds from borrowings under accounts receivable securitization facility         $ 576,400,000 $ 944,200,000 $ 546,600,000        
Accounts receivable securitization facility, due April 2021 [1],[2]         $ 350,000,000.0 $ 370,000,000.0          
Accounts Receivable Securitization Facility [Member]                      
Debt Instrument [Line Items]                      
Maturity date       Apr. 21, 2021 Apr. 21, 2021            
Proceeds from borrowings under accounts receivable securitization facility         $ 350,000,000.0            
Accounts receivable securitization facility, due April 2021         350,000,000.0            
Remaining borrowing capacity         0            
Maximum borrowing capacity       $ 250,000,000.0 $ 350,000,000.0           $ 400,000,000.0
Revolving Credit Facility [Member] | TRC Senior Secured Revolving Credit Facility due June 2023 [Member]                      
Debt Instrument [Line Items]                      
Maturity date         Jun. 30, 2023 Jun. 30, 2023          
Revolving Credit Facility [Member] | TRC Senior Secured Revolving Credit Facility due February 2020 [Member]                      
Debt Instrument [Line Items]                      
Remaining borrowing capacity         $ 115,000,000.0            
Maximum borrowing capacity         $ 670,000,000.0            
Senior Unsecured Notes [Member] | Senior Unsecured 5¼% Notes due May 2023 [Member]                      
Debt Instrument [Line Items]                      
Interest rate on fixed rate debt               5.25%      
Senior Unsecured Notes [Member] | Senior Unsecured 6¾% Notes due March 2024 [Member]                      
Debt Instrument [Line Items]                      
Interest rate on fixed rate debt                 6.75% 6.75%  
Senior Unsecured Notes [Member] | Senior Unsecured 5⅞% Notes due April 2026 [Member]                      
Debt Instrument [Line Items]                      
Maturity date     Apr. 30, 2026                
Interest rate on fixed rate debt     5.875%                
Senior Unsecured Notes [Member] | Senior Unsecured 6½% Senior Notes due July 2027 [Member]                      
Debt Instrument [Line Items]                      
Maturity date   Jul. 31, 2027                  
Interest rate on fixed rate debt   6.50%                  
Senior Unsecured Notes [Member] | Senior Unsecured of 6⅞% Senior Notes due January 2029 [Member]                      
Debt Instrument [Line Items]                      
Maturity date   Jan. 31, 2029                  
Interest rate on fixed rate debt   6.875%                  
Senior Unsecured Notes [Member] | Senior Unsecured 4⅞% Notes due February 2031 [Member]                      
Debt Instrument [Line Items]                      
Interest rate on fixed rate debt                   4.875%  
Senior Unsecured Notes [Member] | Senior Unsecured of 5½% Senior Notes due March 2030 [Member]                      
Debt Instrument [Line Items]                      
Maturity date Mar. 31, 2030                    
Interest rate on fixed rate debt 5.50%                    
Targa Resources Partners LP [Member] | Accounts Receivable Securitization Facility [Member] | Accounts Receivable Securitization Facility Due April 2021 [Member]                      
Debt Instrument [Line Items]                      
Maturity date         Apr. 30, 2021 Apr. 30, 2021          
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. 30, 2023 Jun. 30, 2023          
Remaining borrowing capacity         $ 1,875,600,000            
Maximum borrowing capacity         $ 2,200,000,000            
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5¼% Notes due May 2023 [Member]                      
Debt Instrument [Line Items]                      
Maturity date         May 31, 2023 May 31, 2023          
Interest rate on fixed rate debt         5.25% 5.25%          
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 4¼% Notes due November 2023 [Member]                      
Debt Instrument [Line Items]                      
Maturity date         Nov. 30, 2023 Nov. 30, 2023          
Interest rate on fixed rate debt         4.25% 4.25%          
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 6¾% Notes due March 2024 [Member]                      
Debt Instrument [Line Items]                      
Maturity date         Mar. 31, 2024 Mar. 31, 2024          
Interest rate on fixed rate debt         6.75% 6.75%          
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5⅛% Notes due February 2025 [Member]                      
Debt Instrument [Line Items]                      
Maturity date         Feb. 28, 2025 Feb. 28, 2025          
Interest rate on fixed rate debt         5.125% 5.125%          
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5⅞% Notes due April 2026 [Member]                      
Debt Instrument [Line Items]                      
Maturity date         Apr. 30, 2026 Apr. 30, 2026          
Interest rate on fixed rate debt         5.875% 5.875%          
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 5⅜% Notes due February 2027 [Member]                      
Debt Instrument [Line Items]                      
Maturity date         Feb. 28, 2027 Feb. 28, 2027          
Interest rate on fixed rate debt         5.375% 5.375%          
Targa Resources Partners LP [Member] | Senior Unsecured Notes [Member] | Senior Unsecured 6½% Senior Notes 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% 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 6⅞% 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 4⅞% 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 5½% 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] | Targa Pipeline Partners LP [Member] | Senior Unsecured 4 3/4% Notes due November 2021 [Member]                      
Debt Instrument [Line Items]                      
Maturity date         Nov. 30, 2021 Nov. 30, 2021          
Interest rate on fixed rate debt         4.75% 4.75%          
Targa Resources Partners LP [Member] | 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. 31, 2023 Aug. 31, 2023          
Interest rate on fixed rate debt         5.875% 5.875%          
Targa Resources Partners LP [Member] | 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. 30, 2021 Nov. 30, 2021          
Interest rate on fixed rate debt         4.75% 4.75%          
[1]

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.

[2]

As of December 31, 2020, the Partnership had $350.0 million of qualifying receivables under its $350.0 million Securitization Facility, resulting in zero availability.