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Net Income (Loss) Per Share Attributable to Gilead Common Stockholders (Tables)
9 Months Ended
Sep. 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 EndedNine Months Ended
September 30,September 30,
 2020201920202019
Net income (loss) attributable to Gilead$360 $(1,165)$(1,428)$2,690 
Shares used in per share calculation - basic1,255 1,267 1,257 1,271 
Dilutive effect of stock options and equivalents— — 
Shares used in per share calculation - diluted1,261 1,267 1,257 1,278 
Net income (loss) per share attributable to Gilead common stockholders - basic$0.29 $(0.92)$(1.14)$2.12 
Net income (loss) per share attributable to Gilead common stockholders - diluted$0.29 $(0.92)$(1.14)$2.10