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NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS (Tables) | 9 Months Ended
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Sep. 30, 2021
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:
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
(in millions, except per share amounts) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Net income (loss) attributable to Gilead |  | $ | 2,592 |  |  | $ | 360 |  |  | $ | 5,843 |  |  | $ | (1,428) |
Shares used in per share calculation - basic |  | 1,256 |  |  | 1,255 |  |  | 1,256 |  |  | 1,257 |
Dilutive effect of stock options and equivalents |  | 6 |  |  | 6 |  |  | 6 |  |  | — |
Shares used in per share calculation - diluted |  | 1,262 |  |  | 1,261 |  |  | 1,262 |  |  | 1,257 |
Net income (loss) per share attributable to Gilead common stockholders - basic |  | $ | 2.06 |  |  | $ | 0.29 |  |  | $ | 4.65 |  |  | $ | (1.14) |
Net income (loss) per share attributable to Gilead common stockholders - diluted |  | $ | 2.05 |  |  | $ | 0.29 |  |  | $ | 4.63 |  |  | $ | (1.14) |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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