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EXCEL - IDEA: XBRL DOCUMENT - MPLX LPFinancial_Report.xls
10-Q - 10-Q - MPLX LPd431387d10q.htm
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v2.4.0.6
Commitments and Contingencies - Additional Information (Detail) (Predecessor [Member], USD $)
9 Months Ended 12 Months Ended 1 Months Ended
Sep. 30, 2012
Dec. 31, 2011
May 31, 2012
PHMSA - St. James, LA [Member]
Commitments And Contingencies [Line Items]      
Accrued liabilities for remediation $ 2,000,000 $ 2,300,000  
Site Contingency, Loss Exposure in Excess of Accrual 500,000 500,000  
Civil penalty, settlement amount     842,650
Civil penalty, amount paid     842,650
Supplemental Safety and Environmental Project cost     305,000
Supplemental Safety And Environmental Project, term of project (in months)     42 months
Maximum potential undiscounted payments 1,600,000    
Contractual commitments to acquire property, plant and equipment $ 11,400,000