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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Limited Partner interest in the Partnership, percentage 99.90%    
Operating Leases, Rent Expense $ 45,000,000 $ 46,000,000 $ 46,000,000
Payments for Environmental Liabilities 39,000,000 48,000,000  
Accrual for loss contingency 0    
Loss Contingency, Estimate of Possible Loss 80,000,000    
Total environmental liabilities $ 320,000,000 337,000,000  
Site Contingency, Number of Sites Needing Remediation 40    
Long-term Debt $ 51,054,000,000 46,028,000,000  
PES [Member]      
Limited Partner interest in the Partnership, percentage 7.40%    
Debt Instrument, Debt Default, Amount $ 75,000,000    
Sunoco LP [Member]      
Long-term Debt 3,071,000,000 2,984,000,000  
Rover Pipeline LLC [Member]      
Proposed Environmental Penalty 2,600,000    
SPLP and Mid-Valley Pipeline [Member]      
Loss Contingency, Damages Awarded, Value 5,400,000    
Related To Deductibles [Member]      
Accrual for loss contingency $ 120,000,000 56,000,000  
4.875% senior notes due 2023 [Member] | Sunoco LP [Member]      
Debt Instrument, Interest Rate, Stated Percentage 4.88%    
Senior Notes $ 1,000,000,000 1,000,000,000  
5.500% senior notes due 2026 [Member] | Sunoco LP [Member]      
Senior Notes $ 800,000,000 800,000,000  
5.875% senior notes due 2028 [Member] | Sunoco LP [Member]      
Debt Instrument, Interest Rate, Stated Percentage 5.88%    
Senior Notes $ 400,000,000 $ 400,000,000  
Final Judgement [Member]      
Gain Contingency, Unrecorded Amount 536,000,000    
Expense Reimbursement [Member]      
Gain Contingency, Unrecorded Amount 1,000,000    
Disgorgement [Member]      
Gain Contingency, Unrecorded Amount 595,000,000    
Compensatory Damages [Member]      
Gain Contingency, Unrecorded Amount $ 319,000,000