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Net Income (Loss) Per Share Attributable to Gilead Common Stockholders (Tables) | 6 Months Ended
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Jun. 30, 2020
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 (loss) per share attributable to Gilead common stockholders (in millions, except per share amounts):
|  | Three Months Ended |  |  |  | Six Months Ended |  |
|  | June 30, |  |  |  | June 30, |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Net income (loss) attributable to Gilead |  | $ | (3,339) |  |  | $ | 1,880 |  |  | $ | (1,788) |  |  | $ | 3,855 |
Shares used in per share calculation - basic |  | 1,255 |  |  | 1,270 |  |  | 1,258 |  |  | 1,273 |
Dilutive effect of stock options and equivalents |  | — |  |  | 7 |  |  | — |  |  | 7 |
Shares used in per share calculation - diluted |  | 1,255 |  |  | 1,277 |  |  | 1,258 |  |  | 1,280 |
Net income (loss) per share attributable to Gilead common stockholders - basic |  | $ | (2.66) |  |  | $ | 1.48 |  |  | $ | (1.42) |  |  | $ | 3.03 |
Net income (loss) per share attributable to Gilead common stockholders - diluted |  | $ | (2.66) |  |  | $ | 1.47 |  |  | $ | (1.42) |  |  | $ | 3.01 |

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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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