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Condensed Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues:    
Product sales $ 5,343 $ 5,199
Other revenues 211 265
Total revenues 5,554 5,464
Operating expenses:    
Cost of sales 944 996
Research and development 760 769
Selling, general and administrative 1,127 1,064
Other (3) 44
Total operating expenses 2,828 2,873
Operating income 2,726 2,591
Interest expense, net 338 326
Interest and other income, net 231 195
Income before income taxes 2,619 2,460
Provision for income taxes 308 389
Net income $ 2,311 $ 2,071
Earnings per share:    
Basic (in usd per share) $ 3.27 $ 2.81
Diluted (in usd per share) $ 3.25 $ 2.79
Shares used in calculation of earnings per share:    
Basic (in shares) 707 737
Diluted (in shares) 711 741
Dividends paid per share (in usd per share) $ 1.32 $ 1.15