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Acquisition of Hardin Street Marine LLC (Details)
$ in Millions
 6 Months Ended
Mar. 01, 2017
USD ($)
Mar. 31, 2016
USD ($)
shares
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]      
Contribution from MPC     $ 12
Number of tow boats   18  
Number of barges   219  
Hardin Street Marine [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned   $ 600  
Business Acquisition, Effective Date of Acquisition   Mar. 31, 2016  
Limited Partner [Member] | Hardin Street Marine [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares   22,534,002  
Business Acquisition, Equity Interest Issued or Issuable, Fair Value Assigned   $ 669  
General Partner | Hardin Street Marine [Member]      
Business Acquisition [Line Items]      
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares   459,878  
Business Acquisition, Equity Interest Issued or Issuable, Fair Value Assigned   $ 14  
MPC      
Business Acquisition [Line Items]      
Contribution from MPC $ 6 $ 15  
Percentage of MPC volumes shipped   60.00%