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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Revenues:    
Total revenues $ 6,423 $ 5,548
Costs and expenses:    
Cost of goods sold 1,361 969
Research and development expenses 1,055 1,004
Acquired in-process research and development expenses 62 97
Selling, general and administrative expenses 1,055 1,076
Total costs and expenses 3,533 3,146
Income from operations 2,890 2,402
Interest expense (257) (241)
Other income (expense), net (369) (158)
Income before income taxes 2,264 2,003
Income tax expense 542 465
Net income 1,722 1,538
Net loss attributable to noncontrolling interest (7) (13)
Net income attributable to Gilead $ 1,729 $ 1,551
Net income per share attributable to Gilead common stockholders - basic (in dollars per share) $ 1.38 $ 1.23
Shares used in per share calculation - basic (in shares) 1,256 1,262
Net income per share attributable to Gilead common stockholders - diluted (in dollars per share) $ 1.37 $ 1.22
Shares used in per share calculation - diluted (in shares) 1,262 1,270
Product sales    
Revenues:    
Total revenues $ 6,340 $ 5,467
Royalty, contract and other revenues    
Revenues:    
Total revenues $ 83 $ 81