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Revenue Recognition - Summary of Changes in Carrying Amount of Contract Assets and Contract Liabilities (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Change in Contract with Customer, Asset and Liability [Abstract]
Balance at December 31, 2017	$ 495
Additions and Milestone Billings	(213)
Revenue Recognized	206
Currency translation adjustments and other	(73)
Balance at March 31, 2018	415
Balance at December 31, 2017	519
Additions	273
Revenue Recognized	(205)
Currency translation adjustments and other	11
Balance at March 31, 2018	$ 598

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