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Accumulated Other Comprehensive Income (Loss) - Components of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency Translation Adjustments	$ 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	$ 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Derivative Financial Instruments	46us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	(7)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Defined Benefit Plans	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Total	46nov_OtherComprehensiveIncomeReclassificationAdjustment	(7)nov_OtherComprehensiveIncomeReclassificationAdjustment
Revenue [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency Translation Adjustments	0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember	0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember
Derivative Financial Instruments	65us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember	(13)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember
Defined Benefit Plans	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember
Total	65nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember	(13)nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember
Cost of Revenue [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency Translation Adjustments	0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Derivative Financial Instruments	(1)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Defined Benefit Plans	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Total	(1)nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	3nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Other Income (Expense), Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency Translation Adjustments	0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_OtherIncomeExpenseNetMember	0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_OtherIncomeExpenseNetMember
Defined Benefit Plans	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_OtherIncomeExpenseNetMember	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_OtherIncomeExpenseNetMember
Tax Effect [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency Translation Adjustments	0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember	0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember
Derivative Financial Instruments	(18)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember	3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember
Defined Benefit Plans	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember	0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember
Total	$ (18)nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember	$ 3nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

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Amount after tax of reclassification adjustment from accumulated other comprehensive income (loss) for actuarial gain (loss) related to pension and other postretirement benefit plans.

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