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Reporting Segments (Additions To Property Plant And Equipment Including Acquisitions Net Of Contributions In Aid Of Construction Costs Segments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions [1] $ 3,759 $ 5,268 $ 5,630
Investment In Sunoco LP [Member]      
Segment Reporting Information [Line Items]      
Property, Plant and Equipment, Additions [1] $ 124 $ 148 $ 103
[1] Excluding acquisitions, net of contributions in aid of construction costs (capital expenditures related to the Partnership’s proportionate ownership on an accrual basis).