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Contingencies and commitments (Repatha Patent Litigation) (Details) - Sanofi/Regeneron Patent Litigation - Pending Litigation - patent | 1 Months Ended
--- | ---
Mar. 31, 2018 | Feb. 28, 2016 | Oct. 31, 2014
Other Commitments [Line Items] |  |  |
Number of patents allegedly infringed |  |  | 7
Length of trial |  | 5 days |
Number of challenges | 2 | 2 |

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- Definition Gain Contingency, Number Of Challenges + References No definition available. + Details
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- Definition Number of entity's patents that another entity has allegedly infringed. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6397426&loc=d3e17499-108355 + Details
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