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Business Segment Information Prior Period Adjustment (Details) - Jun. 30, 2015 - USD ($) $ in Millions | Total | Total
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Prior Period Adjustment [Abstract] |  |
Impact Of Correction of Prior Period Error on Net Income | $ 15 | $ 15

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- Definition Impact Of Correction of Prior Period Error on Equity in Earnings of Unconsolidated Affiliates + References No definition available. + Details
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Namespace Prefix: | kbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Period Type: | duration