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Description of Business and Summary of Significant Accounting Policies - Our Business (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014 continent country	Sep. 30, 2013	Sep. 30, 2014 Segment continent country	Sep. 30, 2013
Concentration Risk [Line Items]
Number of reportable segments			1
Number of countries in which entity operates	18		18
Number of continents in which entity operates	4		4
Revenues from four largest contracts	$ 301	$ 349	$ 918	$ 1,185
Increase in operating income due to cumulative catch up adjustments	3	29	30	106
U.S. Army | Revenue | Government Contracts Concentration Risk
Concentration Risk [Line Items]
Concentration percentage			87.00%
Four Largest Contracts | U.S. Army | Revenue | Government Contracts Concentration Risk
Concentration Risk [Line Items]
Concentration percentage			67.00%
Revenues from four largest contracts			619
Contracts Accounted for under Percentage of Completion
Concentration Risk [Line Items]
Increase in operating income due to cumulative catch up adjustments		$ 5		$ 39

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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Revenue earned during the period arising from products sold or services provided under the terms of a contract, not elsewhere specified in the taxonomy. May include government contracts, construction contracts, and any other contract related to a particular project or product.

+ 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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The number of countries in which the entity operates as of balance sheet date.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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

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Number of Continents in Which Entity Operates

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