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Income Taxes (Narrative) (Details) (USD $)
1 Months Ended 3 Months Ended
Dec. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]      
Effective tax rate on income from operations   27.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Undistributed earnings   $ 1,000,000,000us-gaap_UndistributedEarningsOfForeignSubsidiaries  
Effective income tax rate, estimated   25.00%kbr_EffectiveIncomeTaxRateEstimated  
Foreign earnings repatriated 370,000,000us-gaap_ForeignEarningsRepatriated    
Deferred tax liability not recognized   324,000,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries  
Liability for Uncertain Tax Positions, Noncurrent 228,000,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent 227,000,000us-gaap_LiabilityForUncertainTaxPositionsNoncurrent  
Unrecognized Tax Benefits, Period Increase (Decrease)   1,000,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease 3,000,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
U.S. statutory federal rate, expected (benefit) provision   35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
U.S. taxes on foreign unremitted earnings   (6.00%)us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings  
Noncontrolling interests   (8.00%)us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense  
Deferred Tax Assets, Valuation Allowance (538,000,000)us-gaap_DeferredTaxAssetsValuationAllowance (539,000,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ 1,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount $ 22,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount