Summary of Operating Results Which Have Been Reflected As Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of tax	$ (7)	$ 296
Baxalta Inc | Discontinued Operations, Held-for-disposition
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	64	1,362
Cost of sales	(59)	(580)
Marketing and administrative expenses	(20)	(231)
Research and development expenses		(157)
Other income and expense items that are not major		(2)
(Loss) income from discontinued operations before income taxes	(15)	392
Gain on disposal of discontinued operations	17	0
Income tax expense	$ 9	$ 96