Document and Entity Information
12 Months Ended
Dec. 31, 2018
Document And Entity Information [Abstract]  
Entity Registrant Name Targa Resources Partners LP
Trading Symbol NGLS
Entity Central Index Key 0001379661
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Non-accelerated Filer
Document Fiscal Year Focus 2018
Document Fiscal Period Focus FY
Document Type 10-K
Amendment Flag false
Document Period End Date Dec. 31, 2018
Entity Shell Company false
Entity Small Business false
Entity Emerging Growth Company false