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Cash and Equivalents (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Cash and Cash Equivalents [Line Items]        
Cash and equivalents $ 758us-gaap_CashAndCashEquivalentsAtCarryingValue $ 970us-gaap_CashAndCashEquivalentsAtCarryingValue $ 996us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,106us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 353us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
330us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
   
Bank Time Deposits [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 327us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
560us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
   
Cash Held in Joint Venture [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 78us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= kbr_CashHeldinJointVentureMember
80us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= kbr_CashHeldinJointVentureMember
   
International [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 570us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= kbr_InternationalMember
761us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= kbr_InternationalMember
   
International [Member] | Cash [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 180us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_StatementGeographicalAxis
= kbr_InternationalMember
209us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_StatementGeographicalAxis
= kbr_InternationalMember
   
International [Member] | Bank Time Deposits [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 319us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
/ us-gaap_StatementGeographicalAxis
= kbr_InternationalMember
481us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
/ us-gaap_StatementGeographicalAxis
= kbr_InternationalMember
   
International [Member] | Cash Held in Joint Venture [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 71us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= kbr_CashHeldinJointVentureMember
/ us-gaap_StatementGeographicalAxis
= kbr_InternationalMember
71us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= kbr_CashHeldinJointVentureMember
/ us-gaap_StatementGeographicalAxis
= kbr_InternationalMember
   
Domestic [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 188us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= kbr_DomesticMember
209us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= kbr_DomesticMember
   
Domestic [Member] | Cash [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 173us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_StatementGeographicalAxis
= kbr_DomesticMember
121us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_StatementGeographicalAxis
= kbr_DomesticMember
   
Domestic [Member] | Bank Time Deposits [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents 8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
/ us-gaap_StatementGeographicalAxis
= kbr_DomesticMember
79us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_BankTimeDepositsMember
/ us-gaap_StatementGeographicalAxis
= kbr_DomesticMember
   
Domestic [Member] | Cash Held in Joint Venture [Member]        
Cash and Cash Equivalents [Line Items]        
Cash and equivalents $ 7us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= kbr_CashHeldinJointVentureMember
/ us-gaap_StatementGeographicalAxis
= kbr_DomesticMember
$ 9us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_CashAndCashEquivalentsAxis
= kbr_CashHeldinJointVentureMember
/ us-gaap_StatementGeographicalAxis
= kbr_DomesticMember