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Business Segment Information Business Segment Information Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Changes in Estimates at Completion	$ 11kbr_ChangesinEstimatesatCompletion	$ (20)kbr_ChangesinEstimatesatCompletion
Reserve for estimated losses on uncompleted contracts (a)	118us-gaap_ProvisionForLossOnContracts	123us-gaap_ProvisionForLossOnContracts	159us-gaap_ProvisionForLossOnContracts	109us-gaap_ProvisionForLossOnContracts
Canadian Pipe Fabrication And Module Assembly Projects [Member]
Segment Reporting Information [Line Items]
Reserve for estimated losses on uncompleted contracts (a)	37us-gaap_ProvisionForLossOnContracts / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = kbr_CanadianPipeFabricationAndModuleAssemblyProjectsMember	107us-gaap_ProvisionForLossOnContracts / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = kbr_CanadianPipeFabricationAndModuleAssemblyProjectsMember
Power Projects [Member]
Segment Reporting Information [Line Items]
Reserve for estimated losses on uncompleted contracts (a)	$ 65us-gaap_ProvisionForLossOnContracts / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = kbr_PowerProjectsMember

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- Definition

Changes in Estimates at Completion

+ References

No definition available.

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- Definition

Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 35

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=51671739&loc=d3e57777-111642

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