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Condensed Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenues:        
Total revenues $ 5,737 $ 5,904 $ 17,165 $ 17,517
Operating expenses:        
Cost of sales 1,036 1,037 3,103 3,005
Research and development 1,001 926 2,804 2,555
Selling, general and administrative 1,223 1,293 3,637 3,773
Other 1 325 (5) 303
Total operating expenses 3,261 3,581 9,539 9,636
Operating income 2,476 2,323 7,626 7,881
Interest expense, net 313 355 988 1,040
Interest and other income, net 114 126 517 519
Income before income taxes 2,277 2,094 7,155 7,360
Provision for income taxes 309 235 1,016 894
Net income $ 1,968 $ 1,859 $ 6,139 $ 6,466
Earnings per share:        
Basic (in usd per share) $ 3.29 $ 2.88 $ 10.08 $ 9.67
Diluted (in usd per share) $ 3.27 $ 2.86 $ 10.01 $ 9.61
Shares used in calculation of earnings per share:        
Basic (in shares) 599 645 609 669
Diluted (in shares) 602 649 613 673
Product sales [Member]        
Revenues:        
Product sales $ 5,463 $ 5,510 $ 16,323 $ 16,532
Other revenues [Member]        
Revenues:        
Total revenues $ 274 $ 394 $ 842 $ 985