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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Data (Unaudited) Quarterly Financial Data (Unaudited)

Our quarterly financial periods end on the Saturday closest to the last day of the calendar quarter, except
for the fourth quarter which ends on December 31.
 
 
2016 Quarter Ended
(in millions, except per share amounts)
 
Dec. 31
 
Sept. 30  
 
June 30  
 
Mar. 31  
Revenue
 
$
1,095

 
$
897

 
$
932

 
$
847

Gross profit
 
406

 
357

 
369

 
329

Operating income
 
109

 
109

 
109

 
79

Net income
 
$
50

 
$
73

 
$
71

 
$
66

Earnings per share:
Basic
 
$
0.28

 
$
0.41

 
$
0.39

 
$
0.37

Diluted
 
$
0.28

 
$
0.41

 
$
0.39

 
$
0.37

 
 
2015 Quarter Ended
(in millions, except per share amounts)
 
Dec. 31  
 
Sept. 30  
 
June 30  
 
Mar. 31  
Revenue
 
$
994

 
$
902

 
$
920

 
$
837

Gross profit
 
390

 
351

 
348

 
315

Operating income
 
142

 
120

 
104

 
83

Net income
 
$
114

 
$
88

 
$
74

 
$
64

Earnings per share:
Basic
 
$
0.64

 
$
0.48

 
$
0.41

 
$
0.35

Diluted
 
$
0.63

 
$
0.48

 
$
0.41

 
$
0.35