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Revenue Recognition - Summary of Changes in Carrying Amount of Contract Assets and Contract Liabilities (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Change in Contract with Customer, Asset and Liability [Abstract]
Balance at December 31, 2017	$ 495
Additions and Milestone Billings	(456)
Revenue Recognized	500
Currency translation adjustments and other	(94)
Balance at June 30, 2018	445
Balance at December 31, 2017	519
Additions	542
Revenue Recognized	(439)
Currency translation adjustments and other	(13)
Balance at June 30, 2018	$ 609

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