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Long-Term Debt (Sale Leaseback Financing Obligation and Fair Value) (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Apr. 04, 2013 company dealer
Debt Disclosure [Abstract] |  |  |
Number of companies | company |  |  | 2
Number of dealer operated sites | dealer |  |  | 50
Interest rate | 5.125% |  |
Sale leaseback financing obligation | $ 113 | $ 117 |
Long-term debt, fair value | $ 4,400 |  |

X
- Definition Number of companies. + References No definition available. + Details
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- 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

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
Name: | us-gaap_SaleLeasebackTransactionAmountDueUnderFinancingArrangement
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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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Namespace Prefix: | us-gaap_
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Balance Type: | na
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