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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 01, 2020
USD ($)
Jan. 01, 2020
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Payments for Environmental Liabilities       $ 12,000 $ 15,000  
Document Period End Date       Jun. 30, 2021    
Accrual for Environmental Loss Contingencies       $ 308,000   $ 306,000
Loss Contingency, Estimate of Possible Loss       80,000    
Related To Deductibles            
Loss Contingency Accrual, at Carrying Value       $ 88,000   $ 101,000
Sunoco, Inc. [Member]            
Loss Contingency, Pending Claims, Number       5    
Revolution Pipeline [Member]            
Payments for Legal Settlements   $ 2,000        
Sunoco [Member]            
Site Contingency, Number of Sites Needing Remediation       33    
Williams Litigation [Member]            
Loss Contingency, Damages Sought, Value       $ 410,000    
Civil Penalties [Member] | Revolution Pipeline [Member]            
Payments for Legal Settlements   $ 28,600        
Penalty | Revolution Pipeline [Member]            
Payments for Legal Settlements       $ 125    
Cline Class Action | Actual Damages            
Payments for Legal Settlements $ 74,800   $ 80,700      
Cline Class Action | punitive damages            
Payments for Legal Settlements     $ 75,000