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				6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	$ 86	$ 80	$ 47	$ 53	$ 80	$ 53
Provisions	6	15	31	12
Payments	(13)	(11)	(22)	(16)	(24)	(38)
Acquisitions				2
Foreign Currency	(2)	2		(4)
Reversals			(4)
Restructuring Reserve, Ending Balance	77	86	52	47	77	52
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	85	79	46	51	79	51
Provisions	5	13	29	10
Payments	(12)	(9)	(20)	(13)
Acquisitions				2
Foreign Currency	(2)	2		(4)
Reversals			(4)
Restructuring Reserve, Ending Balance	76	85	51	46	76	51
Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance	1	1	1	2	1	2
Provisions	1	2	2	2
Payments	(1)	(2)	(2)	(3)
Acquisitions				0
Foreign Currency	0	0		0
Reversals			0
Restructuring Reserve, Ending Balance	$ 1	$ 1	$ 1	$ 1	$ 1	$ 1