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Revenue Recognition - Summary of Changes in Carrying Amount of Contract Assets and Contract Liabilities (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Change in Contract with Customer, Asset and Liability [Abstract]
Balance at December 31, 2017	$ 495
Additions and Milestone Billings	(948)
Revenue Recognized	1,094
Currency translation adjustments and other	(76)
Balance at December 31, 2018	565
Balance at December 31, 2017	519
Additions and Milestone Billings	861
Revenue Recognized	(798)
Currency translation adjustments and other	(124)
Balance at December 31, 2018	$ 458

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