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Commitments And Contingencies (Leases) (Details)	3 Months Ended
	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: