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Acquisitions Acquisitions (Acquisition Mt. Airy Terminal) (Details)
bbl / d in Thousands, bbl in Millions, $ in Millions
 12 Months Ended
Sep. 26, 2018
USD ($)
bbl / d
bbl
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
shares
Business Acquisition [Line Items]        
Intangibles, net   $ 424 $ 453  
Goodwill   2,586 2,245 $ 2,245
Income/(loss) from equity method investments [1],[2]   $ 240 $ 78 $ (74)
Partners' Capital Account, Units, Acquisitions | shares       22,993,880
Mt. Airy Terminal [Member]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables $ 3      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other 1      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 336      
Intangibles, net 9      
Goodwill 126      
Payments to Acquire Businesses, Gross $ 451      
Storage Capacity | bbl 4      
Barrels Handled | bbl / d 0      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable $ (17)      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other (7)      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest $ 451      
[1] Includes an impairment expense of $89 million related to one of MPLX’s equity method investments for the year ended December 31, 2016.
[2] “Income/(loss) from equity method investments” includes the impact of any basis differential amortization or accretion.