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Revenue - Summary of Changes in Carrying Amount of Contract Assets and Contract Liabilities (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Revenue From Contract With Customer [Abstract]
Balance at December 31, 2018	$ 565
Billings	(215)
Revenue recognized	223
Currency translation adjustments and other	(34)
Balance at March 31, 2019	539
Balance at December 31, 2018	458
Billings	93
Revenue recognized	(118)
Currency translation adjustments and other	(21)
Balance at March 31, 2019	$ 412

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