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Quarterly Information (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results of Operations
In millions, except per share amounts
March 31
 
June 30
 
September 30
 
December 31 (1)
2018
 
 
 
 
 
 
 
Total revenues
$
506

 
$
544

 
$
526

 
$
588

Gross profit
$
223

 
$
250

 
$
264

 
$
289

Operating (loss) income
$
(4
)
 
$
10

 
$
14

 
$
23

Net (loss) income
$
(7
)
 
$
4

 
$
18

 
$
15

Net (loss) income per share:
 
 
 
 
 
 
 
Basic
$
(0.06
)
 
$
0.03

 
$
0.15

 
$
0.13

Diluted
$
(0.06
)
 
$
0.03

 
$
0.15

 
$
0.13

2017
 
 
 
 
 
 
 
Total revenues
$
491

 
$
513

 
$
526

 
$
626

Gross profit
$
225

 
$
242

 
$
250

 
$
307

Operating (loss) income
$
—

 
$
(1
)
 
$
9

 
$
60

Net (loss) income
$
(2
)
 
$
(4
)
 
$
13

 
$
(74
)
Net (loss) income per share:
 
 
 
 
 
 
 
Basic
$
(0.02
)
 
$
(0.03
)
 
$
0.11

 
$
(0.61
)
Diluted
$
(0.02
)
 
$
(0.03
)
 
$
0.10

 
$
(0.61
)

(1) Loss from operations for the three months ended December 31, 2017 includes $126 million tax impact related to 2017 U.S. Tax Reform.