Risk Management and Use of Derivative Financial Instruments - Narratives (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Derivative Instrument Detail
Derivative asset collateral offset	$ 0	$ 0
Derivative, remaining maturity	77 months
Collateral received	$ 0
Total credit exposure on derivatives	12,800,000
Derivatives, net liability position	5,600,000	6,700,000
Aggregate termination value for immediate settlement	5,700,000	$ 7,300,000
KBR \| Discontinued Operations, Disposed of by Means Other than Sale
Derivative Instrument Detail
Intangible liability	$ 15,700,000
KBR \| Sales Revenue
Derivative Instrument Detail
Concentration risk, percentage	12.00%
Single Counterparty
Derivative Instrument Detail
Total credit exposure on derivatives	$ 6,000,000
Interest expense
Derivative Instrument Detail
Estimated amount reclassified from OCI to income, derivatives	(1,500,000)
Other income and (expense)
Derivative Instrument Detail
Estimated amount reclassified from OCI to income, derivatives	$ 5,500,000

Disposal Group, Including Discontinued Operation, Intangible Liability

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- Definition

The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
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- Definition

Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Paragraph 4K
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- Definition

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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- Definition

Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

+ References

No definition available.

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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

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- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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