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Fair value measurements (Details Textual) - USD ($) $ in Millions		3 Months Ended	9 Months Ended
	Oct. 14, 2015	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2016	Oct. 31, 2015
Business Acquisition [Line Items]
Length of time hedged in foreign currency contracts (or less)			3 years
Long-term debt, fair value		$ 39,000	$ 39,000	$ 36,500
Carrying value of debt		35,776	35,776	$ 34,596
Dezima [Member]
Business Acquisition [Line Items]
Maximum additional consideration due contingent on milestones					$ 1,250
Estimated fair values of contingent consideration obligations	$ 110
BioVex [Member]
Business Acquisition [Line Items]
Additional contingent consideration upon achievement of milestones		325	$ 325
Other Government-related and Corporate Debt Securities [Member]
Business Acquisition [Line Items]
Investment maturity period			5 years
Other operating expenses [Member] | Dezima [Member] | AMG 899 [Member]
Business Acquisition [Line Items]
Contingent consideration release		$ (116)

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- Definition

Business Combination, Additional Contingent Consideration Upon Achievement of Milestone

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Business Combination, Fair Value of Contingent Consideration Arrangements, Addition from Acquisitions

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments.

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Fair value portion of notes payable.

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