Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
Cover [Abstract]
Entity Registrant Name	TARGA RESOURCES PARTNERS LP
Trading Symbol	NGLS
Entity Central Index Key	0001379661
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Preferred Units Outstanding		5,000,000
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2020
Entity Small Business	false
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Entity Tax Identification Number	65-1295427
Entity File Number	001-33303
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	TX
Entity Address, Postal Zip Code	77002
City Area Code	713
Local Phone Number	584-1000
Entity Interactive Data Current	Yes
Title of 12(b) Security	9.0% Series A Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units
Security Exchange Name	NYSE
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false