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Commitments And Contingencies (Leases) (Details) | 3 Months Ended
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Mar. 31, 2018
Minimum [Member] |
Operating Leased Assets [Line Items] |
Lease term | 5 years
Maximum [Member] |
Operating Leased Assets [Line Items] |
Lease term | 15 years

X
- Definition Lessee, Operating Lease, Initial Term of Contract + References No definition available. + Details
Name: | sun_LesseeOperatingLeaseInitialTermofContract
Namespace Prefix: | sun_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |