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Related Party Agreements and Transactions - Sales to Related Parties (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Related Party Transaction [Line Items]        
Service revenue - related parties $ 270 $ 246 $ 525 $ 423
Rental income - related parties 70 66 137 104
Product sales - related parties 2 3 4 6
MPC        
Related Party Transaction [Line Items]        
Service revenue - related parties 270 246 525 423
Rental income - related parties 70 66 137 104
Product sales - related parties [1] 2 3 4 6
Product sales to MPC that net to zero $ 53 $ 7 $ 110 $ 12
[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 and six months ended June 30, 2017, these sales totaled $53 million and $110 million, respectively. For the three and six months ended June 30, 2016, these sales totaled $7 million and $12 million, respectively.