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Long-Term Debt (Sale Leaseback Financing Obligation) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Apr. 04, 2013 company dealer
Debt Disclosure [Abstract]
Number of companies completed sale leaseback transaction | company			2
Number of dealer operated sites | dealer			50
Sale Leaseback Transaction, Imputed Interest Rate	5.125%
Sale leaseback financing obligation | $	$ 111	$ 113

X

- Definition

Number of companies.

+ References

No definition available.

+ Details

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Namespace Prefix:	sun_
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Balance Type:	na
Period Type:	instant

X

- Definition

Number of dealer operated sites.

+ References

No definition available.

+ Details

Name:	sun_NumberOfDealerOperatedSites
Namespace Prefix:	sun_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

The liability due as of the balance sheet date for leasebacks accounted for using the deposit method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77913982&loc=d3e50796-112755

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The financing cost related to leases that have been recorded under the deposit method, as a financing or as a capital leases in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration