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Net Income Per Share Attributable to Gilead Common Stockholders (Tables) | 3 Months Ended
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Mar. 31, 2019
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
|  | March 31,
|  | 2019 |  | 2018
Net income attributable to Gilead |  | $ | 1,975 |  |  | $ | 1,538 |
Shares used in per share calculation - basic |  | 1,276 |  |  | 1,307 |
Dilutive effect of stock options and equivalents |  | 7 |  |  | 13 |
Shares used in per share calculation - diluted |  | 1,283 |  |  | 1,320 |
Net income per share attributable to Gilead common stockholders - basic |  | $ | 1.55 |  |  | $ | 1.18 |
Net income per share attributable to Gilead common stockholders - diluted |  | $ | 1.54 |  |  | $ | 1.17 |

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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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