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Acquisitions and Investments - Investment in Pipeline Company (Details)
bbl / d in Thousands, $ in Millions
3 Months Ended
Feb. 15, 2017
USD ($)
bbl / d
Mar. 31, 2017
USD ($)
Bakken Pipeline System    
Schedule of Equity Method Investments [Line Items]    
Crude oil throughput | bbl / d 520  
MarEn Bakken    
Schedule of Equity Method Investments [Line Items]    
Cash paid to acquire equity method investments   $ 500
MPLX LP | Bakken Pipeline System    
Schedule of Equity Method Investments [Line Items]    
Equity method investments, ownership percentage 9.20%  
MPLX LP | MarEn Bakken    
Schedule of Equity Method Investments [Line Items]    
Cash paid to acquire equity method investments $ 500  
Equity method investments, ownership percentage 25.00%  
MPC & Enbridge Energy Partners | Bakken Pipeline System    
Schedule of Equity Method Investments [Line Items]    
Percentage of ownership interest in joint venture acquired 36.75%  
MPC & Enbridge Energy Partners | MarEn Bakken    
Schedule of Equity Method Investments [Line Items]    
Cash paid to acquire equity method investments $ 2,000