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Equity - GP/IDR Exchange (Details) - USD ($)
$ in Millions
 3 Months Ended
Feb. 01, 2018
Mar. 31, 2018
Stockholders Equity Note [Line Items]    
Conversion of GP economic interests   264,413,309
Partners' Capital Account, Exchanges and Conversions   $ 0
Limited Partners Common Units    
Stockholders Equity Note [Line Items]    
Conversion of GP economic interests 275,000,000 [1] 275,000,000
Partners' Capital Account, Exchanges and Conversions $ 10,400  
[1] MPC agreed to waive approximately one-third of the first quarter 2018 distributions on the common units issued in connection with this transaction. As a result of this waiver, MPC will not receive $23.7 million of the distributions that would have otherwise accrued on such common units with respect to the first quarter 2018. See Note 4 for information regarding this acquisition.