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Acquisitions and Investments - Formation of Travel Plaza Joint Venture (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
 [1]
Dec. 31, 2016
USD ($)
Store
Mar. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]      
Contribution of assets to joint venture $ 328   $ 0
PFJ Southeast      
Schedule of Equity Method Investments [Line Items]      
Number of travel plazas | Store   123  
Contribution of assets to joint venture   $ 273  
PFJ Southeast | Property, Plant and Equipment      
Schedule of Equity Method Investments [Line Items]      
Contribution of assets to joint venture   203  
PFJ Southeast | Goodwill      
Schedule of Equity Method Investments [Line Items]      
Contribution of assets to joint venture   62  
PFJ Southeast | Inventories      
Schedule of Equity Method Investments [Line Items]      
Contribution of assets to joint venture   $ 8  
PFJ Southeast | Speedway      
Schedule of Equity Method Investments [Line Items]      
Number of travel plazas | Store   41  
PFJ Southeast | Pilot Flying J      
Schedule of Equity Method Investments [Line Items]      
Number of travel plazas | Store   82  
[1] MarkWest’s contribution of assets to Sherwood Midstream and Sherwood Midstream Holdings. See Note 4.