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Equity-Based Compensation (Phantom Common Unit Awards) (Details) (USD $)
3 Months Ended 9 Months Ended 4 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Dec. 31, 2014
Aug. 31, 2014
Phantom common units [Member]          
Nonvested, Number of Shares [Roll Forward]          
Granted, shares 229,190us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
       
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 19,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
       
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years 6 months        
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Fair Value Of Nonvested Service Phantom Units 22,100,000sun_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
       
Phantom common units [Member] | Non-employee director [Member] | 2012 Long Term Incentive Plan [Member] | Minimum [Member]          
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Vesting Period 1 year        
Phantom common units [Member] | Non-employee director [Member] | 2012 Long Term Incentive Plan [Member] | Maximum [Member]          
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Vesting Period 3 years        
Phantom common units [Member] | Employee Stock Option [Member] | 2012 Long Term Incentive Plan [Member] | Minimum [Member]          
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Vesting Period 2 years        
Phantom common units [Member] | Employee Stock Option [Member] | 2012 Long Term Incentive Plan [Member] | Maximum [Member]          
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Vesting Period 5 years        
Predecessor [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-cash unit based compensation expense   707,000us-gaap_ShareBasedCompensation
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
     
Predecessor [Member] | Phantom common units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-cash unit based compensation expense   109,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
     
Predecessor [Member] | Phantom common units [Member] | 2012 Long Term Incentive Plan [Member]          
Nonvested, Number of Shares [Roll Forward]          
Non-vested at beginning of the period, Shares   36,963us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
36,963us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
  0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Granted, shares     6,354us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Vested, shares     (40,317)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Non-vested at end of period, Shares         0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Non-vested at beginning of the period, Weighted Average Grant Date Fair Value   $ 21.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 21.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
  $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Granted, Weighted Average Grant Date Fair Value     $ 33.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Vested, Weighted Average Grant Date Fair Value     $ 23.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Non-vested at end of period, Weighted Average Grant Date Fair Value         $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (3,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value     $ 18.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
   
Predecessor [Member] | Allocated From SUSS [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense   598,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= sun_AllocatedFromSussMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
     
Successor [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Non-cash unit based compensation expense 195,000us-gaap_ShareBasedCompensation
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
       
Successor [Member] | Phantom common units [Member]          
Nonvested, Number of Shares [Roll Forward]          
Non-vested at beginning of the period, Shares 241,235us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
       
Granted, shares 229,190us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
    241,235us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Non-vested at end of period, Shares 453,931us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
    241,235us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Non-vested at beginning of the period, Weighted Average Grant Date Fair Value $ 45.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
       
Granted, Weighted Average Grant Date Fair Value $ 48.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
    $ 45.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Non-vested at end of period, Weighted Average Grant Date Fair Value $ 48.69us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
    $ 45.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (16,494)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
       
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 45.50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
       
Successor [Member] | Allocated From SUSS [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense 0us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= sun_AllocatedFromSussMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember
       
Allocated From ETP [Member] | Phantom common units [Member] | 2012 Long Term Incentive Plan [Member]          
Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost $ 400,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardCompensationCost1
/ us-gaap_AwardTypeAxis
= us-gaap_PhantomShareUnitsPSUsMember
/ us-gaap_PlanNameAxis
= sun_A2012LongTermIncentivePlanMember
/ us-gaap_StatementScenarioAxis
= sun_AllocatedFromETPMember