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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details)
 1 Months Ended 3 Months Ended
Feb. 28, 2018
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingency Accrual, at Carrying Value   $ 43,000,000   $ 55,000,000
Amounts recorded in balance sheets for contingencies and current litigation not disclosed   0    
Accrual for Environmental Loss Contingencies   $ 337,000,000   $ 337,000,000
Civil penalties $ 12,600,000      
Sunoco, Inc. [Member]        
Loss Contingency, Pending Claims, Number   5    
Payments for Environmental Liabilities   $ 6,000,000 $ 6,000,000  
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    
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    
Compensatory Damages [Member]        
Gain Contingency, Unrecorded Amount   $ 319,000,000    
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