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Investments in Unconsolidated Affiliates - Additional Information (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2022
USD ($)
Apr. 30, 2022
USD ($)
JointVenture
Feb. 28, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
Schedule Of Equity Method Investments [Line Items]            
Gain (loss) from sale of equity-method investment           $ 435.9
GCX DevCo JV [Member]            
Schedule Of Equity Method Investments [Line Items]            
Ownership interest     25.00%      
Repurchase of interest $ 857.0   $ 857.0      
Gain (loss) from sale of equity-method investment         $ 435.9  
South Texas Acquisition [Member]            
Schedule Of Equity Method Investments [Line Items]            
Business acquisition, purchase price   $ 201.9        
Business acquisition, purchase price closing adjustment       $ 1.5    
Number of operated joint ventures | JointVenture   2        
Targa Resources Partners LP [Member] | South Texas Acquisition [Member]            
Schedule Of Equity Method Investments [Line Items]            
Business acquisition, purchase price   $ 201.9        
Number of operated joint ventures | JointVenture   2        
Targa Resources Partners LP [Member] | South Texas Acquisition [Member] | Forecast [Member]            
Schedule Of Equity Method Investments [Line Items]            
Business acquisition, purchase price closing adjustment       $ 1.5    
Targa Resources Partners LP [Member] | South Texas Acquisition [Member] | T2 Joint Ventures [Member]            
Schedule Of Equity Method Investments [Line Items]            
Ownership interest   100.00%        
Targa Resources Partners LP [Member] | T2 La Salle | South Texas Acquisition [Member]            
Schedule Of Equity Method Investments [Line Items]            
Ownership interest   75.00%        
Targa Resources Partners LP [Member] | T2 Eagle Ford | South Texas Acquisition [Member]            
Schedule Of Equity Method Investments [Line Items]            
Ownership interest   50.00%        
Targa Resources Partners LP [Member] | Gulf Coast Fractionators LP [Member] | Logistics and Transportation [Member]            
Schedule Of Equity Method Investments [Line Items]            
Ownership interest           38.80%
Targa Resources Partners LP [Member] | Cayenne Joint Venture [Member] | Gathering And Processing Fees            
Schedule Of Equity Method Investments [Line Items]            
Ownership interest           50.00%
Targa Resources Partners LP [Member] | Little Missouri 4 [Member] | Logistics and Transportation [Member]            
Schedule Of Equity Method Investments [Line Items]            
Ownership interest           50.00%