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Business Segment Information (Schedule Of Balance Sheet Information By Operating Segment) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Total assets $ 3,412 $ 4,078  
Goodwill 324 324  
Equity in and advances to unconsolidated affiliates 281 151  
Non-strategic Business [Member]      
Segment Reporting Information [Line Items]      
Goodwill     $ 153
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Total assets 3,378 3,908  
Goodwill 324 324 619
Equity in and advances to unconsolidated affiliates 281 150  
Operating Segments [Member] | Technology and Consulting [Member]      
Segment Reporting Information [Line Items]      
Total assets 198 173  
Goodwill 31 31 31
Equity in and advances to unconsolidated affiliates 0 0  
Operating Segments [Member] | Engineering and Construction [Member]      
Segment Reporting Information [Line Items]      
Total assets 1,656 2,008  
Goodwill 233 233 528
Equity in and advances to unconsolidated affiliates 255 119  
Operating Segments [Member] | Government Services [Member]      
Segment Reporting Information [Line Items]      
Total assets 464 545  
Goodwill 60 60 $ 60
Equity in and advances to unconsolidated affiliates 26 31  
Operating Segments [Member] | Other Segments [Member]      
Segment Reporting Information [Line Items]      
Total assets 1,060 1,182  
Goodwill 0 0  
Equity in and advances to unconsolidated affiliates 0 0  
Operating Segments [Member] | Non-strategic Business [Member]      
Segment Reporting Information [Line Items]      
Total assets 34 170  
Goodwill 0 0  
Equity in and advances to unconsolidated affiliates $ 0 $ 1