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Earnings per Share (Tables)
 9 Months Ended
Sep. 29, 2018
Earnings Per Share [Abstract]  
Computation of Earnings per Share
Earnings per share (in millions, except share data):
 
 
Three Months Ended

Nine Months Ended
 
 
September 29,
2018

September 30,
2017

September 29,
2018

September 30,
2017
Basic:
 
 
 
 
 
 
 
 
Net income (loss)
 
$
127

 
$
(12
)
 
$
306

 
$
13

Weighted-average shares outstanding
 
53,740,174

 
52,220,868

 
53,516,859

 
52,964,066

Basic earnings per share
 
$
2.37

 
$
(0.23
)
 
$
5.72

 
$
0.25

 
 
 
 
 
 
 
 
 
Diluted:
 
 
 
 
 
 
 
 
Net income (loss)
 
$
127

 
$
(12
)
 
$
306

 
$
13

Weighted-average shares outstanding
 
53,740,174

 
52,220,868

 
53,516,859

 
52,964,066

Dilutive shares
 
684,706

 
—

 
720,694

 
667,433

Diluted weighted-average shares outstanding
 
54,424,880

 
52,220,868

 
54,237,553

 
53,631,499

Diluted earnings per share
 
$
2.34

 
$
(0.23
)
 
$
5.64

 
$
0.25