Summary of Operating Results Which Have Been Reflected As Discontinued Operations (Detail) - USD ($) $ in Millions	3 Months Ended							12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total (loss) income from discontinued operations	$ 3	$ 3	$ (7)	$ 22	$ (1)	$ 258	$ 296	$ (1)	$ 575	$ 2,040
Baxalta Inc | Discontinued Operations, Held-for-disposition
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales								148	2,895	6,523
Cost of sales								(139)	(1,214)	(2,475)
Marketing and administrative expenses								(20)	(547)	(769)
Research and development expenses									(389)	(822)
Other income and expense items that are not major								1	7	105
Total (loss) income from discontinued operations before income taxes								(10)	752	2,562
Gain on disposal of discontinued operations								19
Income tax expense								10	177	522
Total (loss) income from discontinued operations								$ (1)	$ 575	$ 2,040