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Revenue - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Disaggregation Of Revenue [Line Items] |  |
Deferred revenue |  | $ 14
Increase in contract liabilities for net customer deposits | $ 17 |
Receivables, Net [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Contract assets | $ 3 |
Maximum [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Amortization period of revenue recognized | 1 year |

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