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Revenue - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 19	$ 34
Deferred revenue		18
Decrease in contract liabilities for net customer deposits and credits	3
Receivables, Net [Member]
Disaggregation Of Revenue [Line Items]
Contract assets	$ 1	$ 3
Maximum [Member]
Disaggregation Of Revenue [Line Items]
Amortization period of revenue recognized	1 year

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Amortization period of revenue recognized.

+ References

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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.

+ References

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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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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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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.

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