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Partners' Capital Distribution of Preferred Units (Details) $ in Millions	Feb. 14, 2018 USD ($)
Series A Preferred Unit [Member]
Preferred Unit, Quarterly Distribution	$ 10

X

- Definition

Preferred Unit, Quarterly Distribution

+ References

No definition available.

+ Details

Name:	sun_PreferredUnitQuarterlyDistribution
Namespace Prefix:	sun_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=sun_SeriesAPreferredUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: