Document And Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Feb. 15, 2019	Jun. 30, 2017
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Entity Registrant Name	SUNOCO LP
Entity Central Index Key	0001552275
Trading Symbol	SUN
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Public Float			$ 1.3
Entity Well-known Seasoned Issuer	Yes
Entity Shell Company	false
Common Units [Member]
Document Information [Line Items]
Entity Partnership Units Outstanding		82,725,202
Common Class C [Member]
Document Information [Line Items]
Entity Partnership Units Outstanding		16,410,780