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Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 2,507us-gaap_ProfitLoss	$ 2,328us-gaap_ProfitLoss	$ 2,483us-gaap_ProfitLoss
Other comprehensive income (loss) (net of tax):
Currency translation adjustments	(532)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	(115)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	64us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Derivative financial instruments	(233)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	(37)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	99us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Change in defined benefit plans	(65)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	41us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	(33)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Comprehensive income	1,677us-gaap_ComprehensiveIncomeNetOfTax	2,217us-gaap_ComprehensiveIncomeNetOfTax	2,613us-gaap_ComprehensiveIncomeNetOfTax
Net income (loss) attributable to noncontrolling interests	5us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	1us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	(8)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Comprehensive income attributable to Company	$ 1,672nov_OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	$ 2,216nov_OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	$ 2,621nov_OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

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