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Net Income Per Share Attributable to Gilead Common Shareholders (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted |
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Net income attributable to Gilead |  | $ | 4,628 |  |  | $ | 13,501 |  |  | $ | 18,108 |
Shares used in per share calculation - basic |  | 1,307 |  |  | 1,339 |  |  | 1,464 |
Effect of dilutive securities: |  |  |  |  |  |
Stock options and equivalents |  | 12 |  |  | 13 |  |  | 23 |
Conversion spread related to the Convertible Notes |  | — |  |  | 2 |  |  | 14 |
Warrants related to the Convertible Notes |  | — |  |  | 4 |  |  | 20 |
Shares used in per share calculation - diluted |  | 1,319 |  |  | 1,358 |  |  | 1,521 |
Net income per share attributable to Gilead common stockholders - basic |  | $ | 3.54 |  |  | $ | 10.08 |  |  | $ | 12.37 |
Net income per share attributable to Gilead common stockholders - diluted |  | $ | 3.51 |  |  | $ | 9.94 |  |  | $ | 11.91 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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