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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Lessee, Operating Lease, Term of Contract   15 years   15 years    
Operating Leases, Rent Expense, Contingent Rentals   $ 1,000,000 $ 3,000,000 $ 3,000,000 $ 13,000,000  
Loss Contingency Accrual, at Carrying Value   62,000,000   62,000,000   $ 53,000,000
Amounts recorded in balance sheets for contingencies and current litigation not disclosed   0   0    
Payments for Environmental Liabilities   17,000,000 $ 8,000,000 32,000,000 $ 26,000,000  
Accrual for Environmental Loss Contingencies   $ 390,000,000   $ 390,000,000   $ 372,000,000
Civil penalties $ 12,600,000          
Sunoco, Inc. [Member]            
Loss Contingency, Pending Claims, Number   6   6    
Williams [Member]            
Loss on Contract Termination for Default       $ 410,000,000    
Loss Contingency, Damages Sought, Value       10,000,000,000    
Rover Pipeline LLC [Member]            
Proposed Environmental Penalty   $ 2,600,000   2,600,000    
ETE [Member]            
Loss Contingency, Damages Sought, Value       $ 8,500,000    
Sunoco [Member]            
Site Contingency, Number of Sites Needing Remediation   41   41    
Compensatory Damages [Member]            
Gain Contingency, Unrecorded Amount   $ 319,000,000   $ 319,000,000    
Final Judgement [Member]            
Gain Contingency, Unrecorded Amount   536,000,000   536,000,000    
Expense Reimbursement [Member]            
Gain Contingency, Unrecorded Amount   1,000,000   1,000,000    
Disgorgement [Member]            
Gain Contingency, Unrecorded Amount   595,000,000   595,000,000    
4.875% senior notes due 2023 [Member] | Sunoco LP [Member]            
Senior Notes   $ 1,000,000,000   $ 1,000,000,000    
Debt Instrument, Interest Rate, Stated Percentage   4.875%   4.875%    
5.500% senior notes due 2026 [Member] | Sunoco LP [Member]            
Senior Notes   $ 800,000,000   $ 800,000,000    
Debt Instrument, Interest Rate, Stated Percentage   5.50%   5.50%    
5.875% senior notes due 2028 [Member] | Sunoco LP [Member]            
Senior Notes   $ 400,000,000   $ 400,000,000    
Debt Instrument, Interest Rate, Stated Percentage   5.875%   5.875%    
Minimum [Member]            
Lessee, Operating Lease, Term of Contract   5 years   5 years    
Maximum [Member]            
Lessee, Operating Lease, Term of Contract   40 years   40 years