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CIE and BIE BIE (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Billings in Excess of Cost $ 505us-gaap_BillingsInExcessOfCost $ 531us-gaap_BillingsInExcessOfCost
Operating Segments [Member]    
Billings in Excess of Cost 384us-gaap_BillingsInExcessOfCost
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
361us-gaap_BillingsInExcessOfCost
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Operating Segments [Member] | Technology and Consulting [Member]    
Billings in Excess of Cost 64us-gaap_BillingsInExcessOfCost
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kbr_TechnologyandConsultingMember
56us-gaap_BillingsInExcessOfCost
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kbr_TechnologyandConsultingMember
Operating Segments [Member] | Government Services [Member]    
Billings in Excess of Cost 99us-gaap_BillingsInExcessOfCost
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kbr_GovernmentServicesMember
93us-gaap_BillingsInExcessOfCost
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kbr_GovernmentServicesMember
Operating Segments [Member] | Non-strategic Business [Member]    
Billings in Excess of Cost 121us-gaap_BillingsInExcessOfCost
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kbr_NonstrategicBusinessMember
170us-gaap_BillingsInExcessOfCost
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kbr_NonstrategicBusinessMember
Operating Segments [Member] | Engineering and Construction [Member]    
Billings in Excess of Cost $ 221us-gaap_BillingsInExcessOfCost
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kbr_EngineeringandConstructionMember
$ 212us-gaap_BillingsInExcessOfCost
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= kbr_EngineeringandConstructionMember