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Commitments and Contingencies - Performance Bonds and Parent Guarantees (Detail) - Performance Bonds $ in Millions	Sep. 30, 2017 USD ($)
Guarantor Obligations [Line Items]
Total amount of outstanding performance bonds	$ 3,500
Estimate
Guarantor Obligations [Line Items]
Estimated cost to complete bonded projects	$ 889

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- Definition

Estimated Costs To Complete Bonded Projects

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees 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 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248

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