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Revenue - Summary of Changes in Carrying Amount of Contract Assets and Contract Liabilities (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Revenue From Contract With Customer [Abstract]
Balance at December 31, 2020	$ 611
Provision	(1)
Billings	(414)
Revenue recognized	427
Currency translation adjustments and other	(89)
Balance at June 30, 2021	534
Balance at December 31, 2020	354
Billings	492
Revenue recognized	(374)
Currency translation adjustments and other	(80)
Balance at June 30, 2021	$ 392

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