Separation of Baxalta Incorporated - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended
	Mar. 16, 2016	Jan. 27, 2016	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Available-for-sale equity securities, fair value			$ 1,242		$ 5,162
Accounts payable and accrued liabilities			2,387		2,666
Cash flows from operations - discontinued operations			$ (159)	$ 124
Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of common stock retained			19.50%
Common stock, shares outstanding		131,902,719
Disposition of Baxalta shares of common stock	63,823,582	37,573,040
Extinguishment of debt	$ 2,200	$ 1,450
Available-for-sale equity securities, fair value			$ 1,200		5,100
Transition Services Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reduction in marketing and administrative expense			27
Transition Services Agreement | Manufacturing and supply agreement (MSA) | Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales			11
Cost of sales			$ 45
Transition Services Agreement | Minimum | Manufacturing and supply agreement (MSA)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
The termination of service period			5 years
Transition Services Agreement | Maximum | Manufacturing and supply agreement (MSA)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
The termination of service period			10 years
Baxalta Inc | Discontinued Operations, Held-for-disposition
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts payable and accrued liabilities			$ 92		190
Net assets					$ 90
Gain on disposal of discontinued operations			17	0
Net sales			64	1,362
Cost of sales			$ 59	$ 580