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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	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency Translation Adjustments	$ 11us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	$ (25)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Derivative Financial Instruments	12us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	(8)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	22us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Defined Benefit Plans	(6)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	(7)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	(4)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Total	17nov_OtherComprehensiveIncomeReclassificationAdjustment	(40)nov_OtherComprehensiveIncomeReclassificationAdjustment	18nov_OtherComprehensiveIncomeReclassificationAdjustment
Revenue [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Financial Instruments	(26)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember	(16)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember	6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember
Total	(26)nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember	(16)nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember	6nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_SalesMember
Cost of Revenue [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Financial Instruments	43us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	26us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Total	43nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	6nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	26nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Selling, General, and Administrative [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Defined Benefit Plans	(8)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	(8)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	(6)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Total	(8)nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	(8)nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	(6)nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Other Income (Expense), Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Currency Translation Adjustments	11us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_OtherIncomeExpenseNetMember	(25)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_OtherIncomeExpenseNetMember
Total	11nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = nov_OtherIncomeExpenseNetMember	(25)nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = nov_OtherIncomeExpenseNetMember
Tax Effect [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative Financial Instruments	(5)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember	2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember	(10)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember
Defined Benefit Plans	2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember	1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember	2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember
Total	$ (3)nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember	$ 3nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember	$ (8)nov_OtherComprehensiveIncomeReclassificationAdjustment / us-gaap_IncomeStatementLocationAxis = nov_TaxEffectsMember

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Other Comprehensive Income Reclassification Adjustment

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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

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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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