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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, 2019 USD ($)
Revenue From Contract With Customer [Abstract]
Balance at December 31, 2018	$ 565
Billings	(478)
Revenue recognized	557
Currency translation adjustments and other	(59)
Balance at June 30, 2019	585
Balance at December 31, 2018	458
Billings	278
Revenue recognized	(279)
Currency translation adjustments and other	(2)
Balance at June 30, 2019	$ 455

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