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Goodwill and intangible assets (Identifiable Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Finite-lived intangible assets: |  |
Gross carrying amount | $ 18,344 | $ 18,264
Accumulated amortization | (10,121) | (8,744)
Other intangible assets, net | 8,223 | 9,520
Indefinite-lived intangible assets: |  |
Identifiable intangible assets | 18,730 | 19,023
Accumulated amortization | (10,121) | (8,744)
Identifiable intangible assets, net | 8,609 | 10,279
IPR&D [Member] |  |
Indefinite-lived intangible assets: |  |
Indefinite-lived intangible assets | 386 | 759
Developed product technology rights [Member] |  |
Finite-lived intangible assets: |  |
Gross carrying amount | 12,589 | 12,534
Accumulated amortization | (6,796) | (5,947)
Other intangible assets, net | 5,793 | 6,587
Licensing rights [Member] |  |
Finite-lived intangible assets: |  |
Gross carrying amount | 3,275 | 3,275
Accumulated amortization | (1,601) | (1,300)
Other intangible assets, net | 1,674 | 1,975
Marketing-related rights [Member] |  |
Finite-lived intangible assets: |  |
Gross carrying amount | 1,319 | 1,333
Accumulated amortization | (920) | (793)
Other intangible assets, net | 399 | 540
R&D technology rights [Member] |  |
Finite-lived intangible assets: |  |
Gross carrying amount | 1,161 | 1,122
Accumulated amortization | (804) | (704)
Other intangible assets, net | $ 357 | $ 418

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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