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CIE and BIE BIE (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Billings in Excess of Cost $ 484 $ 531
Operating Segments [Member]    
Billings in Excess of Cost 367 361
Operating Segments [Member] | Technology and Consulting [Member]    
Billings in Excess of Cost 69 56
Operating Segments [Member] | Engineering and Construction [Member]    
Billings in Excess of Cost 209 212
Operating Segments [Member] | Government Services [Member]    
Billings in Excess of Cost 89 93
Operating Segments [Member] | Non-strategic Business [Member]    
Billings in Excess of Cost $ 117 $ 170