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Revenue - Summary of Changes in Carrying Amount of Contract Assets and Contract Liabilities (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Revenue From Contract With Customer [Abstract]
Balance at December 31, 2020	$ 611
Provision	1
Billings	(627)
Revenue recognized	573
Currency translation adjustments and other	(92)
Balance at September 30, 2021	466
Balance at December 31, 2020	354
Billings	678
Revenue recognized	(588)
Currency translation adjustments and other	(19)
Balance at September 30, 2021	$ 425

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