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Unapproved Change Orders, and Claims, Against Clients and Estimated Recoveries of Claims Against Suppliers and Subcontractors (Rollforward) (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Unapproved Change Orders [Roll Forward] |  |
Amounts included in project estimates-at-completion at January 1, | $ 1,048 | $ 978
(Decrease) increase in project estimates | (228) | (1)
Approved change orders | (11) | (6)
Foreign currency impact | (1) | (16)
Amounts included in project estimates-at-completion at June 30, | 808 | 955
Amounts recognized over time based on progress at June 30, | $ 808 | $ 955

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- Definition Approved Change Orders + 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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- Definition Unapproved Change Orders And Claims Recorded In Revenues + References No definition available. + Details
Name: | kbr_UnapprovedChangeOrdersAndClaimsRecordedInRevenues
Namespace Prefix: | kbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Unapproved Change Orders, Increase (Decrease) In Estimates + References No definition available. + Details
Name: | kbr_UnapprovedChangeOrdersIncreaseDecreaseInEstimates
Namespace Prefix: | kbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Unapproved Change Orders, Increase (Decrease) In Foreign Currency Effect + References No definition available. + Details
Name: | kbr_UnapprovedChangeOrdersIncreaseDecreaseInForeignCurrencyEffect
Namespace Prefix: | kbr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition unapproved Change Orders [Roll Forward] + References No definition available. + Details
Name: | kbr_UnapprovedChangeOrdersRollForward
Namespace Prefix: | kbr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cost incurred on construction contract for unapproved change order, claim, or similar item subject to uncertainty. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6471471&loc=d3e48698-109348 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant