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Master Limited Partnership (MPLX-Dropdowns to MPLX and GP/IDR Exchange) (Details) - MPLX - USD ($)
shares in Thousands, $ in Millions
Feb. 01, 2018
Sep. 01, 2017
Mar. 01, 2017
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
MPLX 364-day term loan      
Noncontrolling Interest [Line Items]      
Line of credit facility, maximum borrowing capacity $ 4,100    
Debt instrument, term 364 days    
Cash and cash equivalents      
Noncontrolling Interest [Line Items]      
Cash payment for acquisition $ 4,100 $ 420 $ 1,500