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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
Initial Public Offering - Additional Information (Detail) (Successor [Member], USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Oct. 31, 2012
Oct. 31, 2012
Pro Forma [Member]
Oct. 31, 2012
Underwriters [Member]
Pro Forma [Member]
Oct. 31, 2012
MPLX Operations [Member]
Revolving Credit Agreement [Member]
Pro Forma [Member]
Renewals
Oct. 31, 2012
MPLX Operations [Member]
Revolving Credit Agreement [Member]
Maximum [Member]
Pro Forma [Member]
Oct. 31, 2012
MPLX Operations [Member]
Revolving Credit Agreement [Member]
Maximum [Member]
Pro Forma [Member]
Libor Rate Adjustment [Member]
Oct. 31, 2012
MPLX Operations [Member]
Revolving Credit Agreement [Member]
Maximum [Member]
Pro Forma [Member]
Alternative Base Rate [Member]
Oct. 31, 2012
MPLX Operations [Member]
Revolving Credit Agreement [Member]
Minimum [Member]
Pro Forma [Member]
Oct. 31, 2012
MPLX Operations [Member]
Revolving Credit Agreement [Member]
Minimum [Member]
Pro Forma [Member]
Libor Rate Adjustment [Member]
Oct. 31, 2012
MPLX Operations [Member]
Revolving Credit Agreement [Member]
Minimum [Member]
Pro Forma [Member]
Alternative Base Rate [Member]
Oct. 31, 2012
MPLX Operations [Member]
Letter of Credit [Member]
Pro Forma [Member]
Oct. 31, 2012
MPLX Operations [Member]
Swingline Loan [Member]
Pro Forma [Member]
Oct. 31, 2012
MPC [Member]
Pro Forma [Member]
Oct. 31, 2012
MPC [Member]
Management Services Agreements [Member]
Pro Forma [Member]
Agreement
Oct. 02, 2012
MPC [Member]
Employee Services Agreements [Member]
Pro Forma [Member]
Agreement
Oct. 31, 2012
MPC [Member]
Maximum [Member]
Operating Agreements [Member]
Pro Forma [Member]
Oct. 31, 2012
MPC [Member]
Minimum [Member]
Operating Agreements [Member]
Pro Forma [Member]
Oct. 31, 2012
MPC [Member]
Limited Partners Common Units [Member]
Pro Forma [Member]
Oct. 31, 2012
MPC [Member]
Limited Partners Subordinated Units [Member]
Pro Forma [Member]
Oct. 31, 2012
MPC [Member]
Limited Partner Units [Member]
Pro Forma [Member]
Oct. 31, 2012
MPC [Member]
General Partner Units [Member]
Pro Forma [Member]
Oct. 31, 2012
MPC [Member]
Crude Oil [Member]
Commercial Agreements [Member]
Pro Forma [Member]
10-year Transportation Services [Member]
Agreement
Oct. 31, 2012
MPC [Member]
Crude Oil [Member]
Commercial Agreements [Member]
Pro Forma [Member]
5 Year Transportation Services [Member]
Agreement
Oct. 31, 2012
MPC [Member]
Pipelines Products [Member]
Commercial Agreements [Member]
Pro Forma [Member]
10-year Transportation Services [Member]
Agreement
Oct. 31, 2012
MPC [Member]
Handling Crude Oil [Member]
Commercial Agreements [Member]
Pro Forma [Member]
Oct. 31, 2012
MPC [Member]
Handling Crude Oil [Member]
Commercial Agreements [Member]
Pro Forma [Member]
5 Year Transportation Services [Member]
Agreement
Oct. 31, 2012
MPC [Member]
Storage Services [Member]
Commercial Agreements [Member]
Pro Forma [Member]
10-year Transportation Services [Member]
Agreement
Oct. 31, 2012
MPC [Member]
Storage Services Tank Farm [Member]
Commercial Agreements [Member]
Pro Forma [Member]
Oct. 31, 2012
MPC [Member]
Storage Services Tank Farm [Member]
Commercial Agreements [Member]
Pro Forma [Member]
3 Year Transportation Services [Member]
Agreement
Oct. 31, 2012
MPC [Member]
Crude Oil And Product Pipeline [Member]
Commercial Agreements [Member]
Pro Forma [Member]
Initial Public Offering [Line Items]                                                            
Common units for initial public offering   19,895,000 2,595,000                                                      
Price of common unit (in USD per common unit)   $ 22.00                                                        
Partners capital account units (in number of common units)                                   17,056,515 36,951,515   1,508,225                  
Aggregate Percentage of limited partner interest                                       71.60%                    
Aggregate Percentage of General partner interest                                         2.00%                  
Aggregate amount of cash distributed $ 202.7                       $ 202.7                                  
Net proceeds of initial public offering 404.3 404.3                                                        
Offering Costs 31.0 31.0                                                        
Cash retained for capital expenditures 191.6 191.6                                                        
Cash retained for working capital 10.0 10.0                                                        
Financing Costs 2.4 2.4                                                        
Period of Revolving Credit Agreement (in years)       5 years                                                    
Letter of credit issuing borrowing loan capacity       500.0             250.0 50.0                                    
Line of credit facility maximum borrowing capacity       800.0                                                    
Line of credit facility, duration of renewal period (in years)       1 year                                                    
Minimum percentage of lenders required to approve extension of credit agreement               50.00%                                            
Line of credit facility initiation date1               Sep. 14, 2012                                            
Line of credit facility, number of renewal periods       2                                                    
Covenant of ratio of consolidated net debt to consolidated EBITDA (in ratio)         5.0                                                  
Covenant of ratio of consolidated net debt to consolidated EBITDA following certain acquisitions (in ratio)         5.5                                                  
Borrowings of revolving loans under the Credit Agreement bear interest       At either (i) the sum of the Adjusted LIBO Rate (as defined in the Credit Agreement), plus a margin ranging from 1.00 percent to 2.00 percent, or (ii) the sum of the Alternate Base Rate (as defined in the Credit Agreement), plus a margin ranging from zero percent to 1.00 percent                                                    
Margin added to optimal reference rate (in percentage)           2.00% 1.00%   1.00% 0.00%                                        
Commitment fees ranging under credit agreement (in percentage)         0.35%     0.10%                                            
Number of Agreements                           2 2             3 1 4   1 1   4  
Duration of agreements (in years)                               5 years 1 year         10 years 5 years 10 years   5 years 10 years   3 years  
Description of agreement                                                 Four additional two-year terms unless terminated by either party     Additional one-year terms unless terminated by either party   Two additional five-year terms unless terminated by either party
Fees received for providing management services                           $ 0.7