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Equity Method Investments And Variable Interest Entities Equity Method Investments and Variable Interest Entities (Related Party Disclosures) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule of Related Party Transactions Included In Our Consolidated Balance Sheets [Line Items]    
Costs in Excess of Billings, Current $ 425us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear $ 490us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Transactions with Related Parties [Member]    
Schedule of Related Party Transactions Included In Our Consolidated Balance Sheets [Line Items]    
Due from Related Parties, Current 4us-gaap_AccountsReceivableNetCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= kbr_TransactionswithRelatedPartiesMember
7us-gaap_AccountsReceivableNetCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= kbr_TransactionswithRelatedPartiesMember
Costs in Excess of Billings, Current 2us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= kbr_TransactionswithRelatedPartiesMember
2us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= kbr_TransactionswithRelatedPartiesMember
Billings in Excess of Cost $ 32us-gaap_BillingsInExcessOfCostCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= kbr_TransactionswithRelatedPartiesMember
$ 21us-gaap_BillingsInExcessOfCostCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= kbr_TransactionswithRelatedPartiesMember