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Acquisitions (Joint-Interest Acquisition) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 01, 2018
Sep. 01, 2017
USD ($)
in
mi
shares
Mar. 01, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
shares
Schedule of Equity Method Investments [Line Items]                
Units, acquisitions | shares               22,993,880
Aggregate percentage of general partner interest 2.00%   2.00% 2.00%   2.00%    
Income/(loss) from equity method investments [1],[2]           $ 240 $ 78 $ (74)
Contribution from MPC           1,046 675 $ 225
Limited Partners Common Units                
Schedule of Equity Method Investments [Line Items]                
Units, acquisitions | shares               22,534,002
General Partner Units                
Schedule of Equity Method Investments [Line Items]                
Units, acquisitions | shares [3]               459,878
MPC                
Schedule of Equity Method Investments [Line Items]                
Contribution from MPC     $ 6 $ 15        
MPC | Limited Partners Common Units                
Schedule of Equity Method Investments [Line Items]                
Contribution from MPC           0 0 $ 84
MPC | General Partner                
Schedule of Equity Method Investments [Line Items]                
Contribution from MPC           $ 0 0 $ 141
Illinois Extension                
Schedule of Equity Method Investments [Line Items]                
Equity method investment, ownership percentage   35.00%       35.00%    
Pipeline length | mi   168            
Pipeline diameter | in   24            
Number of pump stations   2            
LOOP                
Schedule of Equity Method Investments [Line Items]                
Equity method investment, ownership percentage   41.00%       41.00%    
LOCAP                
Schedule of Equity Method Investments [Line Items]                
Equity method investment, ownership percentage   59.00%       59.00%    
Explorer                
Schedule of Equity Method Investments [Line Items]                
Equity method investment, ownership percentage   25.00%       25.00%    
Pipeline length | mi   1,830            
LOOP LOCAP SAX and Explorer                
Schedule of Equity Method Investments [Line Items]                
Payments to acquire interest in joint venture   $ 420            
Equity interest issued or issuable, value assigned   630            
Total consideration, value assigned   1,050            
Equity interest issued or issuable, fair value assigned   653            
Business Acquisition, Total Consideration, Fair Value Assigned   $ 1,070            
Units, acquisitions | shares           264,413,309    
Aggregate percentage of general partner interest   2.00%            
Income/(loss) from equity method investments           $ 118 $ 21  
LOOP LOCAP SAX and Explorer | General Partner Common Units                
Schedule of Equity Method Investments [Line Items]                
Units, acquisitions | shares   13,719,017            
LOOP LOCAP SAX and Explorer | General Partner Units                
Schedule of Equity Method Investments [Line Items]                
Units, acquisitions | shares   377,778            
LOOP LOCAP SAX and Explorer | MPLX Holdings Inc | Limited Partners Common Units                
Schedule of Equity Method Investments [Line Items]                
Units, acquisitions | shares   1,441,224            
LOOP LOCAP SAX and Explorer | MPLX Logistics LLC | Limited Partners Common Units                
Schedule of Equity Method Investments [Line Items]                
Units, acquisitions | shares   3,350,893            
LOOP LOCAP SAX and Explorer | MPC                
Schedule of Equity Method Investments [Line Items]                
Contribution from MPC         $ 10      
LOOP LOCAP SAX and Explorer | MPC | General Partner                
Schedule of Equity Method Investments [Line Items]                
Payments of Distributions to Affiliates           $ 32    
[1] Includes an impairment expense of $89 million related to one of MPLX’s equity method investments for the year ended December 31, 2016.
[2] “Income/(loss) from equity method investments” includes the impact of any basis differential amortization or accretion.
[3] Changes to the number of general partner units outstanding, other than changes due to contributions made to MPC for the acquisitions of HSM, HST, WHC, MPLXT, the Joint-Interest Acquisition and Refining Logistics and Fuels Distribution, are the result of cash contributions made by the general partner in order to maintain its two percent GP Interest.