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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 ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Document Period End Date       Sep. 30, 2019      
Loss Contingency Accrual, at Carrying Value   $ 61,000,000   $ 61,000,000     $ 55,000,000
Amounts recorded in balance sheets for contingencies and current litigation not disclosed   0   0      
Accrual for Environmental Loss Contingencies   $ 322,000,000   $ 322,000,000     $ 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  
Sunoco, Inc. [Member]              
Loss Contingency, Pending Claims, Number   5   5      
Payments for Environmental Liabilities   $ 16,000,000 $ 17,000,000 $ 31,000,000 $ 32,000,000    
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      
SPLP [Member]              
Proposed Environmental Penalty       5,400,000      
SPLP and Mid-Valley Pipeline [Member]              
Proposed Environmental Penalty       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