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Reportable Segments Table - Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Assets $ 95,541 $ 98,973 $ 88,413
Intrastate Transportation And Storage [Member]      
Segment Reporting Information [Line Items]      
Assets   6,648  
Interstate Transportation and Storage [Member]      
Segment Reporting Information [Line Items]      
Assets   18,111  
Midstream [Member]      
Segment Reporting Information [Line Items]      
Assets   20,332  
NGL and refined products transportation and services [Member]      
Segment Reporting Information [Line Items]      
Assets   19,145  
Crude oil transportation and services [Member]      
Segment Reporting Information [Line Items]      
Assets   22,933  
Investment In Sunoco LP [Member]      
Segment Reporting Information [Line Items]      
Assets   5,438  
Investment In USAC [Member]      
Segment Reporting Information [Line Items]      
Assets   3,730  
Other Segments [Member]      
Segment Reporting Information [Line Items]      
Assets $ 2,546 $ 2,636