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Goodwill And Intangible Assets (Summary Of Goodwill By Reportable Segments) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]        
Balance, Beginning of period   $ 324    
Impairment of goodwill $ (446) 0 $ (446) $ 0
Balance, End of period 324 324 324  
Operating Segments [Member]        
Goodwill [Line Items]        
Goodwill, Translation Adjustments     (2)  
Goodwill, Gross 948 948 948 950
Balance, Beginning of period   324 772  
Impairment of goodwill   0 (446)  
Balance, End of period 324 324 324 772
Goodwill, Impaired, Accumulated Impairment Loss (624) (624) (624) (178)
Non-strategic Business [Member]        
Goodwill [Line Items]        
Goodwill, Gross 331 331 331 331
Balance, Beginning of period     153  
Impairment of goodwill   0 (153)  
Balance, End of period       153
Goodwill, Impaired, Accumulated Impairment Loss (331) (331) (331) (178)
Operating Segments [Member]        
Goodwill [Line Items]        
Goodwill, Translation Adjustments   0 (2)  
Goodwill, Gross 617 617 617 619
Balance, Beginning of period   324 619  
Impairment of goodwill   0 (293) 0
Balance, End of period 324 324 324 619
Goodwill, Impaired, Accumulated Impairment Loss (293) (293) (293) 0
Operating Segments [Member] | Other Segments [Member]        
Goodwill [Line Items]        
Goodwill, Gross 0 0 0 0
Balance, Beginning of period   0    
Impairment of goodwill   0 0 0
Balance, End of period 0 0 0  
Goodwill, Impaired, Accumulated Impairment Loss 0 0 0 0
Operating Segments [Member] | Technology and Consulting [Member]        
Goodwill [Line Items]        
Goodwill, Translation Adjustments   0 0  
Goodwill, Gross 31 31 31 31
Balance, Beginning of period   31 31  
Impairment of goodwill   0 0 0
Balance, End of period 31 31 31 31
Goodwill, Impaired, Accumulated Impairment Loss 0 0 0 0
Operating Segments [Member] | Engineering and Construction [Member]        
Goodwill [Line Items]        
Goodwill, Translation Adjustments     (2)  
Goodwill, Gross 526 526 526 528
Balance, Beginning of period   233 528  
Impairment of goodwill   0 (293) 0
Balance, End of period 233 233 233 528
Goodwill, Impaired, Accumulated Impairment Loss (293) (293) (293) 0
Operating Segments [Member] | Government Services [Member]        
Goodwill [Line Items]        
Goodwill, Gross 60 60 60 60
Balance, Beginning of period   60 60  
Impairment of goodwill   0 0 0
Balance, End of period 60 60 60 60
Goodwill, Impaired, Accumulated Impairment Loss 0 0 0 0
Operating Segments [Member] | Non-strategic Business [Member]        
Goodwill [Line Items]        
Balance, Beginning of period   0    
Impairment of goodwill   0 (153) $ 0
Balance, End of period $ 0 $ 0 $ 0