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Revenue from Contracts with Customers - Summary of Revenue Expected to be Recognized in Future Related to Performance Unsatisfied Obligations (Detail)
$ in Millions
Jun. 30, 2018
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation $ (32)
July One Two Thousand Eighteen [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation (13)
July One Two Thousand Nineteen [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation (19)
Deferred Revenue [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation (29)
Deferred Revenue [Member] | July One Two Thousand Eighteen [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation (11)
Deferred Revenue [Member] | July One Two Thousand Nineteen [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation (18)
Other Deferred Revenue [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation (3)
Other Deferred Revenue [Member] | July One Two Thousand Eighteen [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation (2)
Other Deferred Revenue [Member] | July One Two Thousand Nineteen [Member]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue remaining performance obligation $ (1)