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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingency Accrual, at Carrying Value   $ 54,000,000   $ 54,000,000   $ 55,000,000
Amounts recorded in balance sheets for contingencies and current litigation not disclosed   0   0    
Accrual for Environmental Loss Contingencies   $ 324,000,000   324,000,000   $ 337,000,000
Civil penalties $ 12,600,000          
PES [Member]            
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest   7.40%        
Notes Receivable, Related Parties   $ 75,000,000   $ 75,000,000    
Sunoco, Inc. [Member]            
Loss Contingency, Pending Claims, Number   5   5    
Payments for Environmental Liabilities   $ 9,000,000 $ 9,000,000 $ 15,000,000 $ 15,000,000  
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    
SPLP [Member]            
Proposed Environmental Penalty   $ 1,000,000   1,000,000    
ET [Member]            
Loss Contingency, Damages Sought, Value       8,500,000    
Legal Fees       $ 4,500,000    
Sunoco [Member]            
Site Contingency, Number of Sites Needing Remediation   38   38    
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