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EXCEL - IDEA: XBRL DOCUMENT - MPLX LPFinancial_Report.xls
10-Q - 10-Q - MPLX LPd431387d10q.htm
XML - IDEA: XBRL DOCUMENT - MPLX LPR2.htm
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v2.4.0.6
Related Party Transactions - Additional Information (Detail) (Predecessor [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Related Party Transaction [Line Items]          
Loans receivable from related party         $ 220.4
Interest capitalized (0.2) (0.2) (0.5) (0.4)  
General and administrative expenses [Member]
         
Related Party Transaction [Line Items]          
Stock-based compensation plans expenses 0.2 0.2 0.8 0.4  
MPC [Member] | Centennial [Member]
         
Related Party Transaction [Line Items]          
Equity method investments, ownership percentage 50.00%   50.00%    
MPC [Member] | Muskegon [Member]
         
Related Party Transaction [Line Items]          
Equity method investments, ownership percentage 60.00%   60.00%    
MPCIF [Member]
         
Related Party Transaction [Line Items]          
Credit agreement initiation date       Jun. 21, 2011  
Loans receivable from related party         220.4
Credit agreement termination date     Sep. 28, 2012    
MPC [Member]
         
Related Party Transaction [Line Items]          
Interest capitalized     0.7    
Net non-cash capital distribution to related party       0.5  
MPC [Member] | General and administrative expenses [Member]
         
Related Party Transaction [Line Items]          
Pension expenses $ 2.8   $ 9.5