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Newly-Formed Joint Ventures and Acquisitions - Additional Information Joint Ventures (Details)
$ in Millions
1 Months Ended 4 Months Ended 6 Months Ended
Jan. 01, 2020
USD ($)
Feb. 06, 2018
MBbls / d
JointVenture
May 31, 2018
a
MMcf / d
Apr. 30, 2018
USD ($)
mi
Bcf
Mar. 31, 2018
USD ($)
Jan. 31, 2018
MMcf / d
Dec. 31, 2017
USD ($)
Bcf
Jul. 31, 2017
USD ($)
mi
May 31, 2017
MBbls / d
Apr. 30, 2018
MMcf / d
mi
Bcf
Jun. 30, 2018
USD ($)
MBbls / d
in
Sep. 30, 2017
Business Acquisition [Line Items]                        
Fractionation-related infrastructure funded and owned percentage   100.00%                    
Stonepeak Infrastructure Partners [Member] | DevCo JVs [Member] | Scenario Forecast [Member]                        
Business Acquisition [Line Items]                        
Option to acquire interest, minimum capital increments $ 100.0                      
Option to acquire, percentage of single final purchase 50.00%                      
Hess Midstream Partners LP [Member] | LM4 Plant [Member]                        
Business Acquisition [Line Items]                        
Ownership interest           50.00%            
Processing capacity | MMcf / d           200            
Targa Resources Partners LP [Member]                        
Business Acquisition [Line Items]                        
Payment made to acquire                     $ 3.5  
Stonepeak Infrastructure Partners [Member] | GCX DevCo JV [Member]                        
Business Acquisition [Line Items]                        
Number of development joint ventures | JointVenture   3                    
Ownership interest   80.00%                    
Stonepeak Infrastructure Partners [Member] | Train 6 DevCo JV [Member]                        
Business Acquisition [Line Items]                        
Ownership interest   80.00%                    
Stonepeak Infrastructure Partners [Member] | Grand Prix DevCo JV [Member]                        
Business Acquisition [Line Items]                        
Ownership interest   95.00%                    
GCX DevCo JV [Member] | GCX [Member]                        
Business Acquisition [Line Items]                        
Ownership interest   25.00%                    
Grand Prix DevCo JV [Member] | Grand Prix Joint Venture [Member]                        
Business Acquisition [Line Items]                        
Ownership interest   20.00%                    
Mont Belvieu, Texas [Member] | Train 6 [Member]                        
Business Acquisition [Line Items]                        
Capacity of pipeline | MBbls / d   100                    
Mont Belvieu, Texas [Member] | Train 6 DevCo JV [Member] | Train 6 [Member]                        
Business Acquisition [Line Items]                        
Ownership interest in assets   100.00%                    
Grand Prix Joint Venture [Member]                        
Business Acquisition [Line Items]                        
Expected cost of joint venture         $ 1,700.0              
Grand Prix Joint Venture [Member] | Southern Oklahoma [Member]                        
Business Acquisition [Line Items]                        
Expected cost of joint venture         $ 350.0              
Grand Prix Joint Venture [Member] | Blackstone Energy Partners [Member]                        
Business Acquisition [Line Items]                        
Percentage of interest sold                       25.00%
Grand Prix Joint Venture [Member] | Permian Basin [Member]                        
Business Acquisition [Line Items]                        
Capacity of pipeline | MBbls / d                 300   300  
Length of pipeline | in                     24  
Grand Prix Joint Venture [Member] | Permian Basin [Member] | Texas [Member]                        
Business Acquisition [Line Items]                        
Capacity of pipeline | MBbls / d                     450  
Diameter length of pipeline | in                     30  
Cayenne Joint Venture [Member] | Targa Resources Partners LP [Member]                        
Business Acquisition [Line Items]                        
Conversion of existing mile gas pipeline | mi               62        
Ownership interest               50.00%     50.00%  
Payment made to acquire               $ 5.0        
Project commencement date               2017-12        
GCX [Member] | Targa Resources Partners LP [Member]                        
Business Acquisition [Line Items]                        
Ownership interest                     25.00%  
Natural gas transportation cost expected             $ 1,750.0          
GCX [Member] | Targa Resources Partners LP [Member] | DCP [Member]                        
Business Acquisition [Line Items]                        
Ownership interest             25.00%          
GCX [Member] | Targa Resources Partners LP [Member] | KMTP [Member]                        
Business Acquisition [Line Items]                        
Ownership interest             50.00%          
Agua Blanca Joint Venture [Member] | Targa Resources Partners LP [Member]                        
Business Acquisition [Line Items]                        
Ownership interest       10.00%           10.00%    
Payment made to acquire       $ 3.5                
Project commencement date       2018-04                
Number of miles of natual gas residue pipeline | mi       160           160    
Initial capacity of natural gas | Bcf       1.4           1.4    
Carnero Joint Venture [Member]                        
Business Acquisition [Line Items]                        
Area of gas gathering and processing facilities | a     420,000                  
Carnero Joint Venture [Member] | Texas [Member]                        
Business Acquisition [Line Items]                        
Ownership interest     50.00%                  
Processing capacity | MMcf / d     460             260    
Carnero Joint Venture [Member] | Texas [Member] | Silver Oak II [Member]                        
Business Acquisition [Line Items]                        
Capacity of gas processing plant acquired | MMcf / d     200                  
Carnero Joint Venture [Member] | Western Eagle Ford [Member]                        
Business Acquisition [Line Items]                        
Area of gas gathering and processing facilities | a     315,000                  
Carnero Joint Venture [Member] | Catarina [Member]                        
Business Acquisition [Line Items]                        
Area of gas gathering and processing facilities | a     105,000                  
Maximum [Member]                        
Business Acquisition [Line Items]                        
Ownership interest         100.00%              
Maximum [Member] | Stonepeak Infrastructure Partners [Member] | DevCo JVs [Member] | Scenario Forecast [Member]                        
Business Acquisition [Line Items]                        
Percentage of option to purchase equity stake 50.00%                      
Maximum [Member] | Targa Resources Partners LP [Member] | Apache Corporation [Member]                        
Business Acquisition [Line Items]                        
Percentage of option to purchase equity stake             15.00%          
Maximum [Member] | Grand Prix Joint Venture [Member] | Permian Basin [Member]                        
Business Acquisition [Line Items]                        
Capacity of pipeline | MBbls / d                 550   550  
Maximum [Member] | Grand Prix Joint Venture [Member] | Permian Basin [Member] | Texas [Member]                        
Business Acquisition [Line Items]                        
Capacity of pipeline | MBbls / d                     950  
Maximum [Member] | GCX [Member] | Targa Resources Partners LP [Member]                        
Business Acquisition [Line Items]                        
Capacity of natural gas transported per day | Bcf             1.98