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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
Supplemental Cash Flow Information (Summary of Reconciliation of Contributions from (Distributions to) Former Parent Company) (Detail) (Predecessor [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Predecessor [Member]
   
Supplemental Cash Flow Information [Line Items]    
Contributions from (distributions to) MPC per combined statements of cash flows $ (165.5) $ 17.7
Non-cash distributions to MPC   (0.5)
Contributions from (distributions to) MPC per combined statements of net investment $ (165.5) $ 17.2