Number Of Heavy Equipment Transporters

No definition available.

Name:	kbr_NumberOfHeavyEquipmentTransporters
Namespace Prefix:	kbr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Payment to Partner

+ References

No definition available.

+ Details

Name:	kbr_PaymenttoPartner
Namespace Prefix:	kbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Quantifies the amount of the VIE's assets

+ References

No definition available.

+ Details

Name:	kbr_VariableInterestEntityNonconsolidatedAssets
Namespace Prefix:	kbr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ 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 210.5-02.3-4)

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

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a(1)

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5

+ Details

Name:	us-gaap_AccountsReceivableNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest).

+ References

No definition available.

+ Details

Name:	us-gaap_NoncontrollingInterestInVariableInterestEntity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Related Parties

-URI http://asc.fasb.org/extlink&oid=16382449

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-07.1(c))

-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

+ Details

Name:	us-gaap_RevenueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_SecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Stated interest rate of the subordinated debt.

+ References

No definition available.

+ Details

Name:	us-gaap_SubordinatedBorrowingInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5728-111685

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5747-111685

+ Details

Name:	us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Equity Method Investments And Variable Interest Entities (Narrative) (Details) In Millions, unless otherwise specified	3 Months Ended									3 Months Ended								3 Months Ended			3 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2015 Allenby Connaught Project [Member] Variable Interest Entity, Not Primary Beneficiary [Member] USD ($)	Dec. 31, 2014 Allenby Connaught Project [Member] Variable Interest Entity, Not Primary Beneficiary [Member] USD ($)	Mar. 31, 2015 Ichthys LNG Project [Member] Variable Interest Entity, Not Primary Beneficiary [Member] USD ($)	Dec. 31, 2014 Ichthys LNG Project [Member] Variable Interest Entity, Not Primary Beneficiary [Member] USD ($)	Mar. 31, 2015 U.K. Road Projects [Member] Variable Interest Entity, Not Primary Beneficiary [Member] USD ($)	Dec. 31, 2014 U.K. Road Projects [Member] Variable Interest Entity, Not Primary Beneficiary [Member] USD ($)	Mar. 31, 2015 EBIC Ammonia Project [Member] Variable Interest Entity, Not Primary Beneficiary [Member] USD ($)	Dec. 31, 2014 EBIC Ammonia Project [Member] Variable Interest Entity, Not Primary Beneficiary [Member] USD ($)	Mar. 31, 2015 Maximum [Member]	Mar. 31, 2015 Minimum [Member]	Mar. 31, 2015 Class A 3.5% Index Linked Bonds [Member]	Mar. 31, 2015 Class B 5.9% Fixed Rate Bonds [Member]	Mar. 31, 2015 United Kingdom, Pounds Class A 3.5% Index Linked Bonds [Member] GBP (£)	Mar. 31, 2015 United Kingdom, Pounds Class B 5.9% Fixed Rate Bonds [Member] GBP (£)	Mar. 31, 2015 United States of America, Dollars Class A 3.5% Index Linked Bonds [Member] USD ($)	Mar. 31, 2015 United States of America, Dollars Class B 5.9% Fixed Rate Bonds [Member] USD ($)	Mar. 31, 2015 Transactions with Related Parties [Member] USD ($)	Mar. 31, 2014 Transactions with Related Parties [Member] USD ($)	Dec. 31, 2014 Transactions with Related Parties [Member] USD ($)	Mar. 31, 2015 Nonrecourse Project Finance Debt [Member]
Schedule of Equity Method Investments [Line Items]
Variable Interest Entity Nonconsolidated Assets		$ 16	$ 17	$ 49	$ 49	$ 33	$ 34	$ 40	$ 42
Noncontrolling Interest in Variable Interest Entity	40
Payment to Partner	8kbr_PaymenttoPartner
Percentage interest in unconsolidated joint venture																					50.00%
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount		16		49		33		25
Number of heavy equipment transporters																					91
Secured bonds														56.0	16.7	79.0	24.0
Guaranteed secured bonds, percentage												3.50%	5.90%
Subordinated notes payable, interest rate										16.00%	11.25%
Revenue from Related Parties																		73	68
Accounts Receivable, Net, Current																		$ 4		$ 7