XML 66 R49.htm IDEA: XBRL DOCUMENT v3.8.0.1
Acquisitions Joint-Interest Acquisition (Details)
$ in Millions
3 Months Ended
Sep. 01, 2017
USD ($)
in
mi
shares
Mar. 01, 2017
USD ($)
Mar. 31, 2018
USD ($)
shares
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Schedule of Equity Method Investments [Line Items]            
Units acquired | shares [1]     113,888,889      
General partner ownership interest 2.00% 2.00% 2.00%      
Distributions of cash received from joint-interest acquisition entities to MPC     $ 11   $ 0  
Income from equity method investments [2]     61   5  
Equity method investments     4,033     $ 4,010
Contribution from MPC     1,046   $ 12  
LOOP LOCAP SAX and Explorer Llc            
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          
Total consideration, fair value assigned $ 1,070          
Income from equity method investments     37      
Equity method investments     $ 635      
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          
Equity method investments     $ 288     284
LOOP            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage 41.00%   41.00%      
Equity method investments     $ 225     225
LOCAP            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage 59.00%   59.00%      
Equity method investments     $ 26     24
Explorer            
Schedule of Equity Method Investments [Line Items]            
Equity method investment, ownership percentage 25.00%   25.00%      
Pipeline length | mi 1,830          
Equity method investments     $ 97     $ 89
Limited Partners Common Units            
Schedule of Equity Method Investments [Line Items]            
Units acquired | shares [1]     111,611,111      
General Partner Units            
Schedule of Equity Method Investments [Line Items]            
Units acquired | shares [1]     2,277,778      
General Partner Units | LOOP LOCAP SAX and Explorer Llc            
Schedule of Equity Method Investments [Line Items]            
Units acquired | shares [1] 377,778          
General Partner Common Units | LOOP LOCAP SAX and Explorer Llc            
Schedule of Equity Method Investments [Line Items]            
Units acquired | shares [1] 13,719,017          
MPLX Logistics LLC | Limited Partners Common Units | LOOP LOCAP SAX and Explorer Llc            
Schedule of Equity Method Investments [Line Items]            
Units acquired | shares [1] 3,350,893          
MPLX Holdings Inc | Limited Partners Common Units | LOOP LOCAP SAX and Explorer Llc            
Schedule of Equity Method Investments [Line Items]            
Units acquired | shares [1] 1,441,224          
MPC            
Schedule of Equity Method Investments [Line Items]            
Contribution from MPC   $ 6   $ 10    
General Partner | MPC | LOOP LOCAP SAX and Explorer Llc            
Schedule of Equity Method Investments [Line Items]            
Distributions of cash received from joint-interest acquisition entities to MPC     $ 32      
[1] MPC agreed to waive approximately one-third of the first quarter 2018 distributions on the common units issued in connection with this transaction. As a result of this waiver, MPC will not receive $23.7 million of the distributions that would have otherwise accrued on such common units with respect to the first quarter 2018. See Note 4 for information regarding this acquisition.
[2] “Income (loss) from equity method investments” includes the impact of any basis differential amortization or accretion.