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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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- Definition

Amortization period of revenue recognized.

+ References

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- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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- Definition

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+ References

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Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

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