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Revenue - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Disaggregation Of Revenue [Line Items]
Contract assets	$ 2
Increase in contract liabilies for customer deposits	16
Deferred revenue recognized	$ 12
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Amortization period of revenue recognized	1 year
Accounting Standards Update 2014-09 [Member] | Receivables and Deferred Revenue [Member]
Disaggregation Of Revenue [Line Items]
Additional receivables and deferred revenue related to recognition of receivables with unconditional right to payment	$ 6

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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