Restructuring Activities - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring And Related Activities [Abstract]
Restructuring reserve	$ 73	$ 38	$ 72	$ 99
Restructuring actions for remaining liabilities, Current	67
Restructuring charges	$ 105	$ 51	$ 89