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Related Party Agreements and Transactions - Sales to Related Parties (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Related Party Transaction [Line Items]    
Service revenue - related parties $ 471 $ 255
Rental income - related parties 145 67
Product sales - related parties 4 2
MPC    
Related Party Transaction [Line Items]    
Service revenue - related parties 471 255
Rental income - related parties 145 67
Product sales - related parties [1] 4 2
Product sales to MPC that net to zero $ 79 $ 57
[1] There were additional product sales to MPC that net to zero within the consolidated financial statements as the transactions are recorded net due to the terms of the agreements under which such product was sold. For the three months ended March 31, 2018, these sales totaled $79 million. For the three months ended March 31, 2017, these sales totaled $57 million.