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Percentage-Of-Completion Contracts (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Unapproved change orders $ 39us-gaap_UnapprovedChangeOrdersAmount $ 31us-gaap_UnapprovedChangeOrdersAmount $ 65us-gaap_UnapprovedChangeOrdersAmount $ 115us-gaap_UnapprovedChangeOrdersAmount
Liquidated damages 7kbr_LiquidatedDamages      
Customer Advances, Current 0us-gaap_CustomerAdvancesCurrent      
Parent Share of Probable Unapproved Claims of Unconsolidated Subsidiary [Member]        
Unapproved change orders $ 77us-gaap_UnapprovedChangeOrdersAmount
/ dei_LegalEntityAxis
= kbr_ParentShareOfProbableUnapprovedClaimsOfUnconsolidatedSubsidiaryMember
  $ 79us-gaap_UnapprovedChangeOrdersAmount
/ dei_LegalEntityAxis
= kbr_ParentShareOfProbableUnapprovedClaimsOfUnconsolidatedSubsidiaryMember