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Partners' Capital Partners' Capital (Policies) | 6 Months Ended
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Jun. 30, 2020
Partners' Capital [Abstract] |
Allocation of net income [Policy Text Block] | Allocation of Net Income (Loss) Our Partnership Agreement contains provisions for the allocation of net income and loss to the unitholders. For purposes of maintaining partner capital accounts, the Partnership Agreement specifies that items of income and loss shall be allocated among the partners in accordance with their respective percentage interest. Normal allocations according to percentage interests are made after giving effect to incentive cash distributions, which are allocated 100% to ETO.

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- Definition The disclosure of accounting policy for the allocation of net income among partner capital accounts. + References No definition available. + Details
Name: | sun_AllocationofnetincomePolicyTextBlock
Namespace Prefix: | sun_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PartnersCapitalAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration