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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

X

- 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

X

- 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

X

- 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

X

- 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