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Net Income Per Share Attributable to Gilead Common Shareholders | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Net Income Per Share Attributable to Gilead Common Shareholders | NET INCOME PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS Basic net income per share attributable to Gilead common stockholders is calculated based on the weighted-average number of shares of our common stock outstanding during the period. Diluted net income per share attributable to Gilead common stockholders is calculated based on the weighted-average number of shares of our common stock and other dilutive securities outstanding during the period. The potentially dilutive shares of our common stock resulting from the assumed exercise of outstanding stock options and equivalents were determined under the treasury stock method. Potential shares of common stock excluded from the computation of diluted net income per share attributable to Gilead common shareholders because their effect would have been antidilutive were 15 million, 13 million and 14 million during 2021, 2020 and 2019, respectively. The following table shows the calculation of basic and diluted net income per share attributable to Gilead common stockholders:
|  | Year Ended December 31,
(in millions, except per share amounts) |  | 2021 |  | 2020 |  | 2019
Net income attributable to Gilead |  | $ | 6,225 |  |  | $ | 123 |  |  | $ | 5,386 |
Shares used in per share calculation - basic |  | 1,256 |  |  | 1,257 |  |  | 1,270 |
Dilutive effect of stock options and equivalents |  | 6 |  |  | 6 |  |  | 7 |
Shares used in per share calculation - diluted |  | 1,262 |  |  | 1,263 |  |  | 1,277 |
Net income per share attributable to Gilead common stockholders - basic |  | $ | 4.96 |  |  | $ | 0.10 |  |  | $ | 4.24 |
Net income per share attributable to Gilead common stockholders - diluted |  | $ | 4.93 |  |  | $ | 0.10 |  |  | $ | 4.22 |

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