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CIE and BIE BIE (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Billings in excess of costs and estimated earnings on uncompleted contracts (BIE) $ 509 $ 531
Operating Segments [Member]    
Billings in excess of costs and estimated earnings on uncompleted contracts (BIE) 448 361
Operating Segments [Member] | Technology and Consulting [Member]    
Billings in excess of costs and estimated earnings on uncompleted contracts (BIE) 72 56
Operating Segments [Member] | Engineering and Construction [Member]    
Billings in excess of costs and estimated earnings on uncompleted contracts (BIE) 307 212
Operating Segments [Member] | Government Services [Member]    
Billings in excess of costs and estimated earnings on uncompleted contracts (BIE) 69 93
Operating Segments [Member] | Non-strategic Business [Member]    
Billings in excess of costs and estimated earnings on uncompleted contracts (BIE) $ 61 $ 170