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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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