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Goodwill and intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of goodwill | Changes in the carrying amounts of goodwill were as follows (in millions):
| Years ended December 31,
| 2017 |  | 2016
Beginning balance | $ | 14,751 |  |  | $ | 14,787 |
Goodwill related to acquisitions of businesses | — |  |  | 2 |
Currency translation adjustments | 10 |  |  | (38 | )
Ending balance | $ | 14,761 |  |  | $ | 14,751 |
Schedule of identifiable intangible assets | Other intangible assets consisted of the following (in millions):
| December 31,
| 2017 |  | 2016
| Gross carrying amount |  | Accumulated amortization |  | Other intangible assets, net |  | Gross carrying amount |  | Accumulated amortization |  | Other intangible assets, net
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
Developed product technology rights | $ | 12,589 |  |  | $ | (6,796 | ) |  | $ | 5,793 |  |  | $ | 12,534 |  |  | $ | (5,947 | ) |  | $ | 6,587 |
Licensing rights | 3,275 |  |  | (1,601 | ) |  | 1,674 |  |  | 3,275 |  |  | (1,300 | ) |  | 1,975 |
Marketing-related rights | 1,319 |  |  | (920 | ) |  | 399 |  |  | 1,333 |  |  | (793 | ) |  | 540 |
R&D technology rights | 1,161 |  |  | (804 | ) |  | 357 |  |  | 1,122 |  |  | (704 | ) |  | 418 |
Total finite-lived intangible assets | 18,344 |  |  | (10,121 | ) |  | 8,223 |  |  | 18,264 |  |  | (8,744 | ) |  | 9,520 |
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |
IPR&D | 386 |  |  | — |  |  | 386 |  |  | 759 |  |  | — |  |  | 759 |
Total other intangible assets | $ | 18,730 |  |  | $ | (10,121 | ) |  | $ | 8,609 |  |  | $ | 19,023 |  |  | $ | (8,744 | ) |  | $ | 10,279 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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