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Condensed Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Revenues:    
Revenues $ 5,548 $ 5,281
Costs and expenses:    
Cost of goods sold 969 957
Research and development expenses 1,101 1,057
Selling, general and administrative expenses 1,076 1,030
Total costs and expenses 3,146 3,044
Income from operations 2,402 2,237
Interest expense (241) (254)
Other income (expense), net (158) 367
Income before provision for income taxes 2,003 2,350
Provision for income taxes 465 382
Net income 1,538 1,968
Net loss attributable to noncontrolling interest (13) (7)
Net income attributable to Gilead $ 1,551 $ 1,975
Net income per share attributable to Gilead common stockholders - basic (usd per share) $ 1.23 $ 1.55
Shares used in per share calculation - basic (in shares) 1,262 1,276
Net income per share attributable to Gilead common stockholders - diluted (usd per share) $ 1.22 $ 1.54
Shares used in per share calculation - diluted (in shares) 1,270 1,283
Product sales    
Revenues:    
Revenues $ 5,467 $ 5,200
Royalty, contract and other revenues    
Revenues:    
Revenues $ 81 $ 81