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Certain Transactions - Other Transactions - Additional Information (Detail) $ in Millions					1 Months Ended				3 Months Ended		6 Months Ended	12 Months Ended
	Jan. 08, 2018 USD ($)	Sep. 17, 2017 USD ($)	May 12, 2017 USD ($)	Mar. 03, 2016 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2016 USD ($)	Nov. 30, 2016 USD ($)	Sep. 30, 2016 USD ($) Lawsuit	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2016 USD ($)
Noncash or Part Noncash Acquisitions [Line Items]
Goodwill written off allocated to divested business												$ 79	$ 697
Other asset impairments, restructuring and other items												987	1,836	$ 830
Net (gain) loss from sale of long-lived assets and investments												$ 19	1,090	764
Women Health [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Goodwill written off allocated to divested business													$ 329
CVC Capital Partners Fund VI [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Net gain on sale of portfolio of products										$ 93
Transaction expenses for divestitures										2
PGT Healthcare Partnership [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Other asset impairments, restructuring and other items										64
Write-down of investment										(94)
Net (gain) loss from sale of long-lived assets and investments					$ 50
Women Health [Member] | CVC Capital Partners Fund VI [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Sale agreement with CVC capital partners fund VI		$ 703
Rimsa [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Cash consideration				$ 2,300
Number of lawsuits filed | Lawsuit								2
Alder [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Upfront payment	$ 25
Collaborative agreement milestone payments	$ 175
Otsuka [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Upfront payment			$ 50
Attenukine [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Upfront payment						$ 30
Additional considerations						$ 280								$ 280
Ninlaro [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Upfront payment							$ 150
Payment							$ 150
Celltrion [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Refundable payment															$ 60
Total associated cost															$ 160
Regeneron [Member]
Noncash or Part Noncash Acquisitions [Line Items]
Upfront payment								$ 250
Collaborative agreement milestone payments									$ 60	$ 35	$ 25
Research and development costs								$ 1,000

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