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Equity (Details Textual) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Noncontrolling Interest [Line Items] |  |  |  |  |
Net income (loss) attributable to NCI, net of tax | $ 53,871 | $ (738) | $ 49,053 | $ 7,660 |
Common stock shares repurchased |  |  | 9.7 | 1.2 |
Purchase of treasury stock |  |  | $ 2,998,190 | $ 359,981 |
Equity (Textual) [Abstract] |  |  |  |  |
Equity increase during the period |  |  | 247,100 |  |
Adjustments to additional paid in capital, share-based compensation and exercise of stock options |  |  | 144,400 |  |
Net current period other comprehensive income loss | 56,391 | 11,309 | 97,928 | 10,242 |
Net income attributable to Biogen Inc. | 965,622 | $ 856,858 | 2,715,439 | $ 2,051,320 |
Common stock value authorized for repurchase | $ 5,000,000 |  | $ 5,000,000 |  |
Common stock shares authorized remaining or repurchase | 1.3 |  | 1.3 |  |
Additional paid-in capital | $ 1,342,373 |  | $ 1,342,373 |  | $ 4,196,156
Neurimmune |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Net income (loss) attributable to NCI, net of tax |  |  | $ 60,000 |  |

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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 + Details
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