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Acquisitions (Acquisition of Mt. Airy Terminal) (Details)
bbl / d in Thousands, bbl in Millions, $ in Millions
Sep. 26, 2018
USD ($)
bbl / d
bbl
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 20,184 $ 3,586 $ 3,587
Mt. Airy Terminal        
Business Acquisition [Line Items]        
Storage capacity | bbl 4      
Barrels handled | bbl / d 120      
MPLX | Mt. Airy Terminal        
Business Acquisition [Line Items]        
Cash payment for acquisition $ 451      
Property, plant and equipment, net 336      
Goodwill $ 126