Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
Document Information [Line Items]
Document Transition Report	false
Document Quarterly Report	true
Entity Registrant Name	SUNOCO LP
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Central Index Key	0001552275
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2020
Entity File Number	001-35653
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
Title of 12(b) Security	Common Units Representing Limited Partner Interests
Entity Emerging Growth Company	false
Entity Small Business	false
Trading Symbol	SUN
Security Exchange Name	NYSE
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	30-0740483
Entity Address, Address Line One	8111 Westchester Drive
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Dallas
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75225
City Area Code	214
Local Phone Number	981-0700
Common Units [Member]
Document Information [Line Items]
Entity Partnership Units Outstanding		83,051,624
Common Class C [Member]
Document Information [Line Items]
Entity Partnership Units Outstanding		16,410,780