Business Segment Information (Schedule Of Operations By Reportable Segment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 1,436us-gaap_Revenues	$ 1,633us-gaap_Revenues
Gross profit	70us-gaap_GrossProfit	39us-gaap_GrossProfit
Equity in earnings of unconsolidated affiliates	35	31
Operating income	64us-gaap_OperatingIncomeLoss	10us-gaap_OperatingIncomeLoss
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	1,204	1,414
Gross profit	70	49
Equity in earnings of unconsolidated affiliates	35	31
Operating income	64	20
Operating Segments [Member] \| Other Segments [Member]
Segment Reporting Information [Line Items]
Revenue	0	0
Gross profit	0	0
Equity in earnings of unconsolidated affiliates	0	0
Operating income	(28)	(44)
Operating Segments [Member] \| Technology and Consulting [Member]
Segment Reporting Information [Line Items]
Revenue	72	91
Gross profit	19	15
Equity in earnings of unconsolidated affiliates	0	0
Operating income	17	15
Operating Segments [Member] \| Engineering and Construction [Member]
Segment Reporting Information [Line Items]
Revenue	977	1,137
Gross profit	55	29
Equity in earnings of unconsolidated affiliates	21	17
Operating income	66	33
Operating Segments [Member] \| Government Services [Member]
Segment Reporting Information [Line Items]
Revenue	155	186
Gross profit	(4)	5
Equity in earnings of unconsolidated affiliates	14	14
Operating income	9	16
Operating Segments [Member] \| Non-strategic Business [Member]
Segment Reporting Information [Line Items]
Revenue	232	219
Gross profit	0	(10)
Equity in earnings of unconsolidated affiliates	0	0
Operating income	$ 0	$ (10)

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1,2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.12)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 7

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The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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