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Percentage-Of-Completion Contracts (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Unapproved change orders	$ 39us-gaap_UnapprovedChangeOrdersAmount	$ 31us-gaap_UnapprovedChangeOrdersAmount	$ 65us-gaap_UnapprovedChangeOrdersAmount	$ 115us-gaap_UnapprovedChangeOrdersAmount
Liquidated damages	7kbr_LiquidatedDamages
Customer Advances, Current	0us-gaap_CustomerAdvancesCurrent
Parent Share of Probable Unapproved Claims of Unconsolidated Subsidiary [Member]
Unapproved change orders	$ 77us-gaap_UnapprovedChangeOrdersAmount / dei_LegalEntityAxis = kbr_ParentShareOfProbableUnapprovedClaimsOfUnconsolidatedSubsidiaryMember		$ 79us-gaap_UnapprovedChangeOrdersAmount / dei_LegalEntityAxis = kbr_ParentShareOfProbableUnapprovedClaimsOfUnconsolidatedSubsidiaryMember

X

- Definition

Penalties that the enterprise may be subject to if it does not meet milestone due dates and if claims are asserted and it was responsible for the delays. These generally relate to specified activities that must be met within a project by a set contractual date or achievement of a specified level of output or throughput of a plant the enterprise constructs.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

The current portion of prepayments received from customers for goods or services to be provided in the future.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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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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