Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2019	Feb. 14, 2020	Jun. 30, 2019
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-35653
Entity Registrant Name	SUNOCO LP
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
Title of 12(b) Security	Common Units Representing Limited Partner Interests
Trading Symbol	SUN
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 1.7
Documents Incorporated by Reference	None
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Central Index Key	0001552275
Current Fiscal Year End Date	--12-31
Common Units [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		83,017,163
Common Class C [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		16,410,780