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Fair value measurement (Details Textual) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Length of time hedged in foreign currency contracts (or less) | 3 years |  |
Long-term debt, fair value | $ 33,300 |  | $ 35,000
Carrying value of debt | $ 29,791 |  | $ 33,929
In-process Research and Development |  |  |
Business Acquisition [Line Items] |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | $ 330 |
Other Government-related and Corporate Debt Securities [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Investment maturity period | 5 years |  |

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