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Quarterly financial data (unaudited)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Quarterly financial data (unaudited) Quarterly financial data (unaudited)
The following tables summarize the Company’s unaudited financial data on a quarterly basis. The sum of the quarterly earnings per-share amounts may not equal the amount reported for the full year because per-share amounts are computed independently for each quarter and for the full year based on respective weighted-average shares outstanding and dilutive securities.
Quarterly financial data is summarized as follows (in millions, except per-share data):
 
2019 Quarters ended
 
December 31
 
September 30
 
June 30
 
March 31
Product sales
$
5,881

 
$
5,463

 
$
5,574

 
$
5,286

Gross profit from product sales
$
4,628

 
$
4,427

 
$
4,562

 
$
4,231

Net income
$
1,703

 
$
1,968

 
$
2,179

 
$
1,992

Earnings per share:
 
 
 
 
 
 
 
Basic
$
2.87

 
$
3.29

 
$
3.59

 
$
3.20

Diluted
$
2.85

 
$
3.27

 
$
3.57

 
$
3.18

 
2018 Quarters ended
 
December 31
 
September 30
 
June 30
 
March 31
Product sales
$
6,001

 
$
5,510

 
$
5,679

 
$
5,343

Gross profit from product sales
$
4,905

 
$
4,473

 
$
4,655

 
$
4,399

Net income
$
1,928

 
$
1,859

 
$
2,296

 
$
2,311

Earnings per share:
 
 
 
 
 
 
 
Basic
$
3.04

 
$
2.88

 
$
3.50

 
$
3.27

Diluted
$
3.01

 
$
2.86

 
$
3.48

 
$
3.25