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Goodwill (Tables)
 3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Goodwill by Segment
The carrying amount of goodwill by reportable segments was as follows:
 
 
Defense Solutions
 
Civil
 
Health
 
Total
 
 
(in millions)
Goodwill at January 1, 2016
 
$
792

 
$
244

 
$
171

 
$
1,207

Acquisition of the IS&GS Business
 
1,162

 
1,487

 
766

 
3,415

Goodwill at December 30, 2016
 
1,954

 
1,731

 
937

 
4,622

Adjustment to original purchase price allocation
 
(1
)
 
(1
)
 
(1
)
 
(3
)
Goodwill at March 31, 2017
 
$
1,953

 
$
1,730

 
$
936

 
$
4,619