| Document and Entity Information Document | Mar. 24, 2020 |
| Document And Entity Information [Abstract] | |
| Amendment Flag | false |
| Document Type | 8-K |
| Written Communications | false |
| Title of 12(b) Security | Common Units Representing Limited Partner Interests |
| Entity Address, Address Line One | 8111 Westchester Drive, Suite 400 |
| Entity Incorporation, State or Country Code | DE |
| Document Period End Date | Mar. 24, 2020 |
| Entity File Number | 001-35653 |
| Entity Tax Identification Number | 30-0740483 |
| Entity Address, City or Town | Dallas |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75225 |
| Trading Symbol | SUN |
| Security Exchange Name | NYSE |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Registrant Name | SUNOCO LP |
| City Area Code | 214 |
| Local Phone Number | 981-0700 |
| Entity Central Index Key | 0001552275 |
