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Equity Method Investments And Variable Interest Entities Equity Method Investments and Variable Interest Entities (Schedule of Equity in Earnings of Unconsolidated Affiliates) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Equity In Earnings of Unconsolidated Affiliates [Line Items]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 144us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures		$ 151us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Income (Loss) from Equity Method Investments	35us-gaap_IncomeLossFromEquityMethodInvestments	31us-gaap_IncomeLossFromEquityMethodInvestments
Collection (repayment) of advances from (to) unconsolidated affiliates, net	6kbr_CollectionsRepaymentOfAdvancesFromToUnconsolidatedAffiliatesNet	7kbr_CollectionsRepaymentOfAdvancesFromToUnconsolidatedAffiliatesNet
Beginning Balance [Member]
Equity In Earnings of Unconsolidated Affiliates [Line Items]
Equity Method Investments			151us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_BeginningBalanceMember	156us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_BeginningBalanceMember
Joint Venture Earnings [Member]
Equity In Earnings of Unconsolidated Affiliates [Line Items]
Equity Method Investments	35us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_JointVentureEarningsMember		163us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_JointVentureEarningsMember
Dividends Paid by Joint Venture [Member]
Equity In Earnings of Unconsolidated Affiliates [Line Items]
Equity Method Investments	(37)us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_DividendsPaidbyJointVentureMember		(249)us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_DividendsPaidbyJointVentureMember
Advances [Member]
Equity In Earnings of Unconsolidated Affiliates [Line Items]
Equity Method Investments	(6)us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_AdvancesMember		(13)us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_AdvancesMember
Cumulative Translation Adjustment [Member]
Equity In Earnings of Unconsolidated Affiliates [Line Items]
Equity Method Investments	(6)us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_CumulativeTranslationAdjustmentMember		(1)us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_CumulativeTranslationAdjustmentMember
Other Activity [Member]
Equity In Earnings of Unconsolidated Affiliates [Line Items]
Equity Method Investments	1us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_OtherActivityMember		0us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_OtherActivityMember
Subtotal Before Reclassification [Member]
Equity In Earnings of Unconsolidated Affiliates [Line Items]
Equity Method Investments	138us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_SubtotalBeforeReclassificationMember		56us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_SubtotalBeforeReclassificationMember
Ending Balance [Member]
Equity In Earnings of Unconsolidated Affiliates [Line Items]
Equity Method Investments	144us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_EndingBalanceMember		151us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_EndingBalanceMember
Reclassification of excess distribution [Member]
Equity In Earnings of Unconsolidated Affiliates [Line Items]
Equity Method Investments	9us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_ReclassificationofexcessdistributionMember		102us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_ReclassificationofexcessdistributionMember
Recognition of Excess Distribution [Member]
Equity In Earnings of Unconsolidated Affiliates [Line Items]
Equity Method Investments	$ (3)us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_RecognitionofExcessDistributionMember		$ (7)us-gaap_EquityMethodInvestments / kbr_EquityMethodInvestmentsActivityAxis = kbr_RecognitionofExcessDistributionMember

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- Definition

Total collection or (repayment) advances from (to) unconsolidated affiliates with (A) an entity in which the company has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Also includes aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date which are usually due after one year (or one business cycle).

+ References

No definition available.

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

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

-Publisher FASB

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-Topic 230

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-Paragraph 28

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

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

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

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

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