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Percentage-Of-Completion Contracts (Schedule Of Unapproved Claims And Change Orders) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
Contractors [Abstract]
Unapproved Change Orders And Claims Recorded In Revenues	$ 37kbr_UnapprovedChangeOrdersAndClaimsRecordedInRevenues	$ 50kbr_UnapprovedChangeOrdersAndClaimsRecordedInRevenues
Unapproved change orders	39us-gaap_UnapprovedChangeOrdersAmount	65us-gaap_UnapprovedChangeOrdersAmount	31us-gaap_UnapprovedChangeOrdersAmount	115us-gaap_UnapprovedChangeOrdersAmount
Changes in Estimates at Completion	11kbr_ChangesinEstimatesatCompletion	(20)kbr_ChangesinEstimatesatCompletion
Change Orders Approved by Customer	$ (3)kbr_ChangeOrdersApprovedbyCustomer	$ (30)kbr_ChangeOrdersApprovedbyCustomer

X

- Definition

Change Orders Approved by Customer

+ References

No definition available.

+ Details

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Namespace Prefix:	kbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Changes in Estimates at Completion

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Unapproved Change Orders And Claims Recorded In Revenues

+ References

No definition available.

+ Details

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Namespace Prefix:	kbr_
Data Type:	xbrli:monetaryItemType
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X

- Details

Name:	us-gaap_ContractorsAbstract
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X

- Definition

The amount of costs incurred on unapproved change orders when it is probable that the cost will be recovered through a change in the contract price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 910

-SubTopic 340

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=51666792&loc=d3e50000-109363



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 910

-SubTopic 310

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=51673017&loc=d3e49324-109356



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph c(3)

-Article 5

+ Details

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