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Claims and Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended
	Dec. 31, 2013	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Claims receivable		$ 592us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedAfterOneYear	$ 570us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedAfterOneYear
Performance Bond Recovery Including Interest	26kbr_RecoveryOnPerformanceBonds
Engineering and Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Claims receivable		425us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedAfterOneYear / us-gaap_StatementBusinessSegmentsAxis = kbr_EngineeringandConstructionMember	425us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedAfterOneYear / us-gaap_StatementBusinessSegmentsAxis = kbr_EngineeringandConstructionMember
Government Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Claims receivable		167us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedAfterOneYear / us-gaap_StatementBusinessSegmentsAxis = kbr_GovernmentServicesMember	145us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedAfterOneYear / us-gaap_StatementBusinessSegmentsAxis = kbr_GovernmentServicesMember
Pemex [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount of judgment awarded to enterprise		465kbr_AmountOfJudgmentAwardedToEnterprise / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbr_PemexMember
Performance Bond Recovery Including Interest		106kbr_RecoveryOnPerformanceBonds / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbr_PemexMember
Claims and Account Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Claims receivable		$ 401us-gaap_ContractsReceivableClaimsAndUncertainAmountsExpectedToBeCollectedAfterOneYear / us-gaap_BalanceSheetLocationAxis = kbr_ClaimsandAccountReceivableMember

X

- Definition

Amount of judgment in favor of enterprise

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Allowable recovery on performance bonds from customer

+ References

No definition available.

+ Details

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Period Type:	duration

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- Details

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X

- Definition

Amount of billed or unbilled claims or similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts that are expected to be collected after the next fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ 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 210.5-02.3(c)(3),(4))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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X

- Details

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X

- Details

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