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Acquisitions - Acquisition of Mt. Airy Terminal (Details)
bbl / d in Thousands, bbl in Millions, $ in Millions
Sep. 26, 2018
USD ($)
bbl / d
bbl
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Goodwill   $ 20,277 $ 20,184
Mt. Airy Terminal      
Storage capacity | bbl 4    
Barrels handled | bbl / d 120    
Mt. Airy Terminal | MPLX      
Cash consideration $ 446    
Property, plant and equipment, net 336    
Goodwill 121    
Mt. Airy Terminal | As originally reported | MPLX      
Cash consideration 451    
Mt. Airy Terminal | Adjustments | MPLX      
Cash consideration $ 5