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

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- 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

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