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Debt And Other Credit Facilities (Consolidated amount of non-recourse project-finance debt of a VIE) (Details) In Millions, unless otherwise specified			3 Months Ended
	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 Minimum [Member]	Mar. 31, 2015 Maximum [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 ($)	Mar. 31, 2015 United States of America, Dollars Class B 5.9% Fixed Rate Bonds [Member] USD ($)
Debt Instrument [Line Items]
Guaranteed secured bonds, percentage	3.50%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_StatementClassOfStockAxis = kbr_ClassThreePointFivePercentageIndexLinkedBondsMember	5.90%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_StatementClassOfStockAxis = kbr_ClassBFivePointNinePercentageFixedRateBondsMember
Secured bonds					£ 56.0us-gaap_SecuredDebt / us-gaap_CurrencyAxis = currency_GBP / us-gaap_StatementClassOfStockAxis = kbr_ClassThreePointFivePercentageIndexLinkedBondsMember	£ 16.7us-gaap_SecuredDebt / us-gaap_CurrencyAxis = currency_GBP / us-gaap_StatementClassOfStockAxis = kbr_ClassBFivePointNinePercentageFixedRateBondsMember	$ 79.0us-gaap_SecuredDebt / us-gaap_CurrencyAxis = currency_USD / us-gaap_StatementClassOfStockAxis = kbr_ClassThreePointFivePercentageIndexLinkedBondsMember	$ 24.0us-gaap_SecuredDebt / us-gaap_CurrencyAxis = currency_USD / us-gaap_StatementClassOfStockAxis = kbr_ClassBFivePointNinePercentageFixedRateBondsMember
Subordinated notes payable, interest rate			11.25%us-gaap_SubordinatedBorrowingInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember	16.00%us-gaap_SubordinatedBorrowingInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- 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

X

- Details

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

X

- 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

X

- 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