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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
Fair Value Measurements - Additional Information (Detail) (Predecessor [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets fair value $ 0 $ 0
MPCIF [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans receivable fair value measured using an income approach   $ 220.4
Maximum [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Percent of trade receivables and payables with balances outstanding greater than 90 days 1.00%