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Net Income Per Share Attributable to Gilead Common Stockholders (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Schedule of the Calculation of Basic and Diluted Earnings Per Share | The following table summarizes the calculation of basic and diluted net income per share attributable to Gilead common stockholders (in millions, except per share amounts):
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Net income attributable to Gilead |  | $ | 1,817 |  |  | $ | 3,073 |  |  | $ | 3,355 |  |  | $ | 5,775 |
Shares used in per share calculation - basic |  | 1,298 |  |  | 1,307 |  |  | 1,302 |  |  | 1,307 |
Dilutive effect of stock options and equivalents |  | 10 |  |  | 10 |  |  | 12 |  |  | 12 |
Shares used in per share calculation - diluted |  | 1,308 |  |  | 1,317 |  |  | 1,314 |  |  | 1,319 |
Net income per share attributable to Gilead common stockholders - basic |  | $ | 1.40 |  |  | $ | 2.35 |  |  | $ | 2.58 |  |  | $ | 4.42 |
Net income per share attributable to Gilead common stockholders - diluted |  | $ | 1.39 |  |  | $ | 2.33 |  |  | $ | 2.55 |  |  | $ | 4.38 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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