Summary of Operating Results Which Have Been Reflected As Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of tax	$ 3	$ 3	$ 3	$ (4)
Baxalta Inc | Discontinued Operations, Held-for-disposition
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales	1	24	7	144
Cost of sales		(20)	(5)	(135)
Marketing and administrative expenses			(1)	(20)
Income (loss) from discontinued operations before income taxes	1	4	1	(11)
Gain on disposal of discontinued operations	2		2	17
Income tax expense		1		10
Income (loss) from discontinued operations, net of tax	$ 3	$ 3	$ 3	$ (4)