Inventories, Net - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Inventory [Line Items]
General and administrative costs included in work-in-process inventories	$ 529	$ 565
General and administrative costs incurred and recorded in inventories	3,300	2,700	$ 2,500
General and administrative costs charged to cost of sales from inventories	$ 3,300	$ 2,800	$ 2,500