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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, 2020 USD ($)
Revenue From Contract With Customer [Abstract]
Balance at December 31, 2019	$ 643
Provision	(2)
Billings	(692)
Revenue recognized	655
Currency translation adjustments and other	(49)
Balance at September 30, 2020	555
Balance at December 31, 2019	427
Billings	924
Revenue recognized	(946)
Currency translation adjustments and other	(34)
Balance at September 30, 2020	$ 371

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