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Business combinations (Details Textual) - USD ($) $ in Millions | Aug. 25, 2019 | Jul. 15, 2019 | Sep. 30, 2019 | Dec. 31, 2018
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Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  | $ 14,705 | $ 14,699
Nuevolution |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred |  | $ 183 |  |
Goodwill |  | 26 |  |
Fair value of liabilities assumed, deferred tax liabilities |  | 22 |  |
Fair value of assets acquired and liabilities assumed, net other assets and liabilities |  | 29 |  |
Nuevolution | R & D Technology rights |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Finite-lived Intangible Assets Acquired |  | $ 150 |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 10 years |  |
Celgene |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred | $ 13,400 |  |  |

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Assets (Liabilities) + References No definition available. + Details
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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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