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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities (Narrative) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Operating Leases, Rent Expense     $ 48,000,000 $ 47,000,000 $ 45,000,000
Payments for Environmental Liabilities     28,000,000 29,000,000  
Total environmental liabilities   $ 306,000,000 $ 293,000,000 306,000,000  
Site Contingency, Number of Sites Needing Remediation     34    
Loss Contingency, Damages Awarded, Value   74,800,000 $ 80,700,000    
Loss Contingency, Damages Sought, Value $ 410,000,000        
Loss Contingency, Estimate of Possible Loss     $ 550,000,000    
Number of litigation cases     5    
Rover Pipeline          
Litigation Settlement, Amount Awarded to Other Party     $ 40,000,000    
Punitive Damages [Member]          
Loss Contingency, Damages Awarded, Value     75,000,000    
Related To Deductibles [Member]          
Loss Contingency Accrual   $ 101,000,000 $ 144,000,000 $ 101,000,000