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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

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Effective Income Tax Rate, Estimated

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date.

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Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

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