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Revenue Recognition - Summary of Changes in Carrying Amount of Contract Assets and Contract Liabilities (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Change in Contract with Customer, Asset and Liability [Abstract]
Balance at December 31, 2017	$ 495
Additions and Milestone Billings	(606)
Revenue Recognized	637
Currency translation adjustments and other	(43)
Balance at September 30, 2018	483
Balance at December 31, 2017	519
Additions	856
Revenue Recognized	(676)
Currency translation adjustments and other	(129)
Balance at September 30, 2018	$ 570

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