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Acquisitions (Joint-Interest Acquisition) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 01, 2018
Sep. 01, 2017
USD ($)
in
mi
shares
Mar. 01, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]              
Aggregate percentage of general partner interest 2.00%   2.00%   2.00%    
Income from equity method investments [1],[2]         $ 290 $ 247 $ 78
Contribution from MPC         346 11,980 675
MPC              
Schedule of Equity Method Investments [Line Items]              
Contribution from MPC     $ 6        
MPC | Limited Partners Common Units              
Schedule of Equity Method Investments [Line Items]              
Contribution from MPC         315 0 0
MPC | General Partner              
Schedule of Equity Method Investments [Line Items]              
Contribution from MPC         $ 0 0 0
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%          
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          
Aggregate percentage of general partner interest   2.00%          
Income from equity method investments         $ 110 $ 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]
“Income from equity method investments” includes the impact of any basis differential amortization or accretion.
[2] The financial information for equity method investments for 2019 includes financial information of equity method investments acquired as part of the Merger. The financial information for equity method investments for 2018 includes financial information of equity method investments acquired as part of the Merger for the last three months of 2018. The financial information for equity method investments for 2017 does not include financial information of equity method investments acquired as part of the Merger. See Note 1 for additional information