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Commitments And Contingencies (Leases, Schedule of Rent Expense) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash rent: |  |
Store base rent | $ 15 | $ 16
Equipment and other rent | 0 | 4
Total cash rent | 15 | 20
Non-cash rent: |  |
Straight-line rent | 0 | 0
Net rent expense | $ 15 | $ 20

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- Definition Cash Rent [Abstract] + References No definition available. + Details
Name: | sun_CashRentAbstract
Namespace Prefix: | sun_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Non-Cash Rent [Abstract] + References No definition available. + Details
Name: | sun_NonCashRentAbstract
Namespace Prefix: | sun_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating leases, cash rent expense. + References No definition available. + Details
Name: | sun_OperatingLeasesCashRentExpense
Namespace Prefix: | sun_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Operating leases, rent expense, equipment and other rentals. + References No definition available. + Details
Name: | sun_OperatingLeasesRentExpenseEquipmentAndOtherRentals
Namespace Prefix: | sun_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Operating leases, rent expense, store base rent. + References No definition available. + Details
Name: | sun_OperatingLeasesRentExpenseStoreBaseRent
Namespace Prefix: | sun_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Difference between actual rental income due and rental income recognized on a straight-line basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_StraightLineRent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration