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Goodwill and other intangible assets (Identifiable Intangible Assets) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amounts | $ 18,608 | $ 18,790
Accumulated amortization | (11,539) | (11,402)
Other intangible assets, net | 7,069 | 7,388
Gross carrying amount | 18,663 | 18,845
Accumulated amortization | (11,539) | (11,402)
Intangible assets, net | 7,124 | 7,443
In-process Research and Development [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets | 55 | 55
Developed-Product-Technology Rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amounts | 12,559 | 12,573
Accumulated amortization | (7,639) | (7,479)
Other intangible assets, net | 4,920 | 5,094
Licensing Rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amounts | 3,693 | 3,772
Accumulated amortization | (2,064) | (2,032)
Other intangible assets, net | 1,629 | 1,740
Marketing-Related Rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amounts | 1,211 | 1,297
Accumulated amortization | (947) | (1,019)
Other intangible assets, net | 264 | 278
Research and Development Technology Rights [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amounts | 1,145 | 1,148
Accumulated amortization | (889) | (872)
Other intangible assets, net | $ 256 | $ 276

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