Exit and Disposal Costs - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring And Related Activities [Abstract]
Severance expense	$ 55	$ 13	$ 76
Accrued severance costs paid	52	57	170
Other exit related costs		15	65
Accrued facility and other exit costs paid	2	21	$ 158
Accrued severance costs	36	33
Restructuring Reserve	$ 17	$ 19
Expected period for all payments for severance cost	2017
Accrued liabilities of exit costs to be settled in next several years	$ 14