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Percentage-Of-Completion Contracts (Tables) | 12 Months Ended
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Dec. 31, 2015
Contractors [Abstract] |
Schedule Of Unapproved Claims And Change Orders | The amounts of unapproved change orders and claims included in determining the profit or loss on contracts are as follows:
Dollars in millions | 2015 |  | 2014
Beginning balance | $ | 31 |  |  | $ | 115 |
Adjustments due to changes in estimates-at-completion | 71 |  |  | 87 |
Adjustments due to approvals | (42 | ) |  | (171 | )
Adjustment due to disposition of businesses | (14 | ) |  | — |
Amounts included in project estimates-at-completion at December 31, | $ | 46 |  |  | $ | 31 |
Amounts recorded in revenues on a percentage-of-completion basis at December 31, | $ | 41 |  |  | $ | 24 |

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- Definition This element may be used to capture the disclosure pertaining to an entity's unapproved claims and change orders used in determining the profit or loss on contracts. + References No definition available. + Details
Name: | kbr_ScheduleOfUnapprovedClaimsAndChangeOrdersTableTextBlock
Namespace Prefix: | kbr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ContractorsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration