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Quarterly financial data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly financial data (unaudited)
Quarterly financial data is summarized as follows (in millions, except per-share data):
 
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

 
2017 Quarters ended
 
December 31
 
September 30
 
June 30
 
March 31
Product sales
$
5,569

 
$
5,453

 
$
5,574

 
$
5,199

Gross profit from product sales
$
4,510

 
$
4,463

 
$
4,550

 
$
4,203

Net (loss) income
$
(4,264
)
 
$
2,021

 
$
2,151

 
$
2,071

(Loss) earnings per share:
 
 
 
 
 
 
 
Basic
$
(5.89
)
 
$
2.78

 
$
2.93

 
$
2.81

Diluted(1)
$
(5.89
)
 
$
2.76

 
$
2.91

 
$
2.79


____________ 
(1) 
During periods of net loss, diluted loss per share is equal to basic loss per share because the antidilutive effect of potential common shares is disregarded.