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Acquisitions - Acquisition of Andeavor (Details) - USD ($)
$ in Millions
Oct. 01, 2018
Jun. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 20,277 $ 20,184
Andeavor      
Business Acquisition [Line Items]      
Total fair value of consideration transferred $ 23,460    
Fair value of MPC shares issued 19,970    
Cash payment to Andeavor stockholders 3,490    
Goodwill 16,428    
Goodwill, expected tax deductible amount 893    
Andeavor | Refining & Marketing      
Business Acquisition [Line Items]      
Goodwill 4,820    
Andeavor | Midstream      
Business Acquisition [Line Items]      
Goodwill 7,720    
Andeavor | Retail      
Business Acquisition [Line Items]      
Goodwill $ 3,890