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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 Supplemental Cash Flow Information) (Detail) (Predecessor [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Predecessor [Member]
   
Net cash provided by operating activities included:    
Interest paid (net of amounts capitalized)   $ 0.2
Income taxes paid through MPC $ 0.2 $ 0.2