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Condensed Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenues	$ 1,436us-gaap_ContractsRevenue	$ 1,633us-gaap_ContractsRevenue
Cost of revenues	(1,366)us-gaap_CostOfServices	(1,594)us-gaap_CostOfServices
Gross profit	70us-gaap_GrossProfit	39us-gaap_GrossProfit
Equity in earnings of unconsolidated affiliates	35us-gaap_IncomeLossFromEquityMethodInvestments	31us-gaap_IncomeLossFromEquityMethodInvestments
General and administrative expenses	(39)us-gaap_GeneralAndAdministrativeExpense	(60)us-gaap_GeneralAndAdministrativeExpense
Asset impairment and restructuring charges	(2)us-gaap_RestructuringCharges	0us-gaap_RestructuringCharges
Operating income	64us-gaap_OperatingIncomeLoss	10us-gaap_OperatingIncomeLoss
Other non-operating income (expense)	6us-gaap_OtherNonoperatingIncomeExpense	(9)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes and noncontrolling interests	70us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	1us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes	(19)us-gaap_IncomeTaxExpenseBenefit	(21)us-gaap_IncomeTaxExpenseBenefit
Net income (loss)	51us-gaap_ProfitLoss	(20)us-gaap_ProfitLoss
Net income attributable to noncontrolling interests	(7)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(23)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss) attributable to KBR	$ 44us-gaap_NetIncomeLoss	$ (43)us-gaap_NetIncomeLoss
Earnings Per Share [Abstract]
Basic	$ 0.30us-gaap_EarningsPerShareBasic	$ (0.29)us-gaap_EarningsPerShareBasic
Diluted	$ 0.30us-gaap_EarningsPerShareDiluted	$ (0.29)us-gaap_EarningsPerShareDiluted
Basic weighted average common shares outstanding	145us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	146us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted weighted average common shares outstanding	145us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	146us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Cash dividends declared per share	$ 0.08us-gaap_CommonStockDividendsPerShareDeclared	$ 0.08us-gaap_CommonStockDividendsPerShareDeclared

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Aggregate dividends declared during the period for each share of common stock outstanding.

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