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Costs and Estimated Earnings on Uncompleted Contracts - Costs and Estimated Earnings on Uncompleted Contracts (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Contractors [Abstract]
Costs incurred on uncompleted contracts	$ 10,740us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms	$ 10,442us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
Estimated earnings	4,734nov_EstimatedEarnings	4,699nov_EstimatedEarnings
Costs and estimated earnings on uncompleted contracts, Gross	15,474nov_CostsAndEstimatedEarningsOnUncompletedContractsGross	15,141nov_CostsAndEstimatedEarningsOnUncompletedContractsGross
Less: Billings to date	15,045nov_BillingsToDate	15,038nov_BillingsToDate
Total net estimate billing on uncompleted contracts	429nov_NetEstimateCostsInExcessOfBillingsOrBillingsInExcessOfCostsOnUncompletedContracts	103nov_NetEstimateCostsInExcessOfBillingsOrBillingsInExcessOfCostsOnUncompletedContracts
Costs and estimated earnings in excess of billings on uncompleted contracts	1,926us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear	1,878us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedWithinOneYear
Billings in excess of costs and estimated earnings on uncompleted contracts	(1,497)us-gaap_BillingsInExcessOfCost	(1,775)us-gaap_BillingsInExcessOfCost
Total net estimate billing on uncompleted contracts	$ 429nov_NetEstimateCostsInExcessOfBillingsOrBillingsInExcessOfCostsOnUncompletedContracts	$ 103nov_NetEstimateCostsInExcessOfBillingsOrBillingsInExcessOfCostsOnUncompletedContracts

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Net Estimate Billing On Uncompleted Contracts.

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Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

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