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Goodwill and other intangible assets (Identifiable Intangible Assets) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amounts | $ 18,801 | $ 18,344
Accumulated amortization | (11,075) | (10,121)
Intangible assets, net | 7,726 | 8,223
Gross carrying amount | 18,857 | 18,730
Accumulated amortization | (11,075) | (10,121)
Intangible assets, net | 7,782 | 8,609
In-process Research and Development [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | 56 | 386
Developed-Product-Technology Rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amounts | 12,586 | 12,589
Accumulated amortization | (7,312) | (6,796)
Intangible assets, net | 5,274 | 5,793
Licensing Rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amounts | 3,771 | 3,275
Accumulated amortization | (1,921) | (1,601)
Intangible assets, net | 1,850 | 1,674
Marketing-Related Rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amounts | 1,285 | 1,319
Accumulated amortization | (982) | (920)
Intangible assets, net | 303 | 399
R&D Technology Rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amounts | 1,159 | 1,161
Accumulated amortization | (860) | (804)
Intangible assets, net | $ 299 | $ 357

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