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Business Segment Information (Schedule Of Operations By Reportable Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Revenue $ 1,381 $ 1,659 $ 2,817 $ 3,292
Gross profit 74 28 144 67
Equity in earnings of unconsolidated affiliates 53 49 88 80
Operating income 96 25 160 35
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 1,191 1,476 2,395 2,890
Gross profit 72 47 142 96
Equity in earnings of unconsolidated affiliates 53 49 88 80
Operating income 68 44 132 64
Operating Segments [Member] | Other Segments [Member]        
Segment Reporting Information [Line Items]        
Revenue 0 0 0 0
Gross profit 0 0 0 0
Equity in earnings of unconsolidated affiliates 0 0 0 0
Operating income (36) (36) (64) (80)
Operating Segments [Member] | Technology and Consulting [Member]        
Segment Reporting Information [Line Items]        
Revenue 80 100 152 191
Gross profit 21 15 40 30
Equity in earnings of unconsolidated affiliates 0 0 0 0
Operating income 20 15 37 30
Operating Segments [Member] | Engineering and Construction [Member]        
Segment Reporting Information [Line Items]        
Revenue 953 1,213 1,930 2,350
Gross profit 52 33 107 62
Equity in earnings of unconsolidated affiliates 40 20 61 37
Operating income 74 38 140 71
Operating Segments [Member] | Government Services [Member]        
Segment Reporting Information [Line Items]        
Revenue 158 163 313 349
Gross profit (1) (1) (5) 4
Equity in earnings of unconsolidated affiliates 13 29 27 43
Operating income 10 27 19 43
Operating Segments [Member] | Non-strategic Business [Member]        
Segment Reporting Information [Line Items]        
Revenue 190 183 422 402
Gross profit 2 (19) 2 (29)
Equity in earnings of unconsolidated affiliates 0 0 0 0
Operating income $ 28 $ (19) $ 28 $ (29)