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Business Segment Information Schedule of Changes in Estimates (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Change in Accounting Estimate [Line Items]
Reserve for estimated losses on uncompleted contracts (a)	$ 118us-gaap_ProvisionForLossOnContracts	$ 159us-gaap_ProvisionForLossOnContracts	$ 123us-gaap_ProvisionForLossOnContracts	$ 109us-gaap_ProvisionForLossOnContracts
Initial Changes [Member]
Change in Accounting Estimate [Line Items]
Reserve for estimated losses on uncompleted contracts (a)	12us-gaap_ProvisionForLossOnContracts / us-gaap_ChangeInAccountingEstimateByTypeAxis = kbr_InitialChangesMember		48us-gaap_ProvisionForLossOnContracts / us-gaap_ChangeInAccountingEstimateByTypeAxis = kbr_InitialChangesMember
Amortization of Loss Provision [Member]
Change in Accounting Estimate [Line Items]
Reserve for estimated losses on uncompleted contracts (a)	(53)us-gaap_ProvisionForLossOnContracts / us-gaap_ChangeInAccountingEstimateByTypeAxis = kbr_AmortizationofLossProvisionMember		(34)us-gaap_ProvisionForLossOnContracts / us-gaap_ChangeInAccountingEstimateByTypeAxis = kbr_AmortizationofLossProvisionMember
Power Projects [Member]
Change in Accounting Estimate [Line Items]
Reserve for estimated losses on uncompleted contracts (a)	$ 65us-gaap_ProvisionForLossOnContracts / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = kbr_PowerProjectsMember

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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

+ Details

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