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Net Income (Loss) Per Share Attributable to Gilead Common Stockholders (Tables)
 9 Months Ended
Sep. 30, 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 (loss) per share attributable to Gilead common stockholders (in millions, except per share amounts):
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2019
 
2018
 
2019
 
2018
Net income (loss) attributable to Gilead
 
$
(1,165
)
 
$
2,097

 
$
2,690

 
$
5,452

Shares used in per share calculation - basic
 
1,267

 
1,296

 
1,271

 
1,302

Dilutive effect of stock options and equivalents
 
—

 
11

 
7

 
11

Shares used in per share calculation - diluted
 
1,267

 
1,307

 
1,278

 
1,313

 
 
 
 
 
 
 
 
 
Net income (loss) per share attributable to Gilead common stockholders - basic
 
$
(0.92
)
 
$
1.62

 
$
2.12

 
$
4.19

Net income (loss) per share attributable to Gilead common stockholders - diluted
 
$
(0.92
)
 
$
1.60

 
$
2.10

 
$
4.15