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Business Segment Information (Tables)
 3 Months Ended
Apr. 01, 2016
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information by Segment
The segment information for the periods presented was as follows:
 
Three Months Ended
 
April 1,
2016
 
April 3,
2015
 
(in millions)
Revenues:

 

National Security Solutions
$
898

 
$
862

Health and Infrastructure Sector
414

 
385

Corporate and Other
—

 
(1
)
Total revenues
$
1,312

 
$
1,246

 
 
 
 
Operating income (loss):
 
 
 
National Security Solutions
$
72

 
$
62

Operating income margin
8.0
%
 
7.2
 %
Health and Infrastructure Sector
36

 
(7
)
Operating income (negative) margin
8.7
%
 
(1.8
)%
Corporate and Other
(19
)
 
(17
)
Total operating income
$
89

 
$
38

Operating income margin
6.8
%
 
3.0
 %