Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 02, 2019
Document And Entity Information [Abstract]    
Entity Registrant Name TARGA RESOURCES CORP.  
Trading Symbol TRGP  
Entity Central Index Key 0001389170  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   232,780,711
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Entity Small Business false  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Entity Tax Identification Number 203701075  
Entity File Number 001-34991  
Entity Address, Address Line One 811 Louisiana St  
Entity Address, Address Line Two Suite 2100  
Entity Address, City or Town Houston  
Entity Address, State or Province Texas  
Entity Address, Postal Zip Code 77002  
City Area Code 713  
Local Phone Number 584-1000