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MPLX LP - Dropdowns to MPLX and GP/IDR Exchange (Details) - MPLX LP - USD ($)
shares in Thousands, $ in Millions
Feb. 01, 2018
Jan. 02, 2018
Sep. 01, 2017
Mar. 01, 2017
MPLX 364-day term loan        
Noncontrolling Interest [Line Items]        
Maximum borrowing capacity $ 4,100 $ 4,100    
Debt instrument, term 364 days 364 days    
Cash and Cash Equivalents        
Noncontrolling Interest [Line Items]        
Cash consideration $ 4,100   $ 420 $ 1,500
Limited Partner        
Noncontrolling Interest [Line Items]        
Units issued, number of units 112,000   19,000 13,000
Conversion of stock, shares issued 275,000      
General Partner        
Noncontrolling Interest [Line Items]        
Units issued, number of units 2,000   378 264