Restructuring Charges And Asset Impairments - Summary of Company's Restructuring Liabilities and Related Activity for Each Type of Exit Cost (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	$ 80	$ 53
Provisions	15	12
Payments	(11)	(16)
Acquisitions	0	2
Foreign Currency	2	(4)
Restructuring Reserve, Ending Balance	86	47
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	79	51
Provisions	13	10
Payments	(9)	(13)
Restructuring Reserve, Ending Balance	85	46
Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	1	2
Provisions	2	2
Payments	(2)	(3)
Restructuring Reserve, Ending Balance	1	1
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Acquisitions	0	2
Foreign Currency	2	(4)
Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Acquisitions	0	0
Foreign Currency	$ 0	$ 0