Restructuring Charges And Asset Impairments - Summary of Company's Restructuring Liabilities by Reporting Segment (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
Reporting Segment One [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	33	36
Provisions	12	6
Payments	(5)	(10)
Acquisitions	0	2
Foreign Currency	1	(3)
Restructuring Reserve, Ending Balance	41	31
Reporting Segment Two [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	47	16
Provisions	3	6
Payments	(6)	(5)
Acquisitions	0	0
Foreign Currency	1	(1)
Restructuring Reserve, Ending Balance	45	16
Total Reporting Segment [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	80	52
Provisions	15	12
Payments	(11)	(15)
Acquisitions	0	2
Foreign Currency	2	(4)
Restructuring Reserve, Ending Balance	86	47
Corporate [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	0	1
Provisions	0	0
Payments	0	(1)
Acquisitions	0	0
Foreign Currency	0	0
Restructuring Reserve, Ending Balance	0	0
Restructuring and Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	15	12
Restructuring Reserve [Roll Forward]
Provisions	15	12
Restructuring and Asset Impairments [Member] | Corporate [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	0	0
Restructuring Reserve [Roll Forward]
Provisions	$ 0	$ 0