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Condensed Consolidated Statements of Income (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenues:        
Product sales $ 5,453 $ 5,516 $ 16,226 $ 16,229
Other revenues 320 295 821 797
Total revenues 5,773 5,811 17,047 17,026
Operating expenses:        
Cost of sales 990 1,027 3,010 3,095
Research and development 877 990 2,519 2,762
Selling, general and administrative 1,170 1,244 3,443 3,739
Other 297 23 347 121
Total operating expenses 3,334 3,284 9,319 9,717
Operating income 2,439 2,527 7,728 7,309
Interest expense, net 325 325 972 932
Interest and other income, net 267 216 627 503
Income before income taxes 2,381 2,418 7,383 6,880
Provision for income taxes 360 401 1,140 1,093
Net income $ 2,021 $ 2,017 $ 6,243 $ 5,787
Earnings per share:        
Basic (in usd per share) $ 2.78 $ 2.70 $ 8.52 $ 7.70
Diluted (in usd per share) $ 2.76 $ 2.68 $ 8.46 $ 7.63
Shares used in calculation of earnings per share:        
Basic (in shares) 728 747 733 752
Diluted (in shares) 733 753 738 758
Dividends paid per share (in usd per share) $ 1.15 $ 1 $ 3.45 $ 3