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Reportable Segments Table - Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]    
Assets $ 96,218 $ 95,144
Intrastate Transportation And Storage [Member]    
Segment Reporting Information [Line Items]    
Assets 7,461 7,549
Interstate Transportation and Storage [Member]    
Segment Reporting Information [Line Items]    
Assets 17,974 17,730
Midstream [Member]    
Segment Reporting Information [Line Items]    
Assets 19,364 18,816
NGL and refined products transportation and services [Member]    
Segment Reporting Information [Line Items]    
Assets 21,614 21,578
Crude oil transportation and services [Member]    
Segment Reporting Information [Line Items]    
Assets 19,235 18,335
Investment In Sunoco LP [Member]    
Segment Reporting Information [Line Items]    
Assets 5,380 5,267
Investment In USAC [Member]    
Segment Reporting Information [Line Items]    
Assets 2,896 2,949
Other Segments [Member]    
Segment Reporting Information [Line Items]    
Assets $ 2,294 $ 2,920