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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 01, 2020
USD ($)
Jan. 01, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Payments for Environmental Liabilities     $ 6,000 $ 9,000  
Document Period End Date     Mar. 31, 2021    
Accrual for Environmental Loss Contingencies     $ 301,000   $ 306,000
Loss Contingency, Estimate of Possible Loss     80,000    
Related To Deductibles          
Loss Contingency Accrual, at Carrying Value     $ 49,000   77,000
Sunoco, Inc. [Member]          
Loss Contingency, Pending Claims, Number     5    
Revolution Pipeline [Member]          
Payments for Legal Settlements   $ 2,000      
SPLP [Member]          
Proposed Environmental Penalty     $ 5,400    
SPLP and Mid-Valley Pipeline [Member]          
Proposed Environmental Penalty     $ 1,000    
Sunoco [Member]          
Site Contingency, Number of Sites Needing Remediation     35    
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