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Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 313us-gaap_ProfitLoss	$ 589us-gaap_ProfitLoss
Currency translation adjustments	(418)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	(51)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Changes in derivative financial instruments, net of tax	(66)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	14us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Comprehensive income (loss)	(171)us-gaap_ComprehensiveIncomeNetOfTax	552us-gaap_ComprehensiveIncomeNetOfTax
Comprehensive income attributable to noncontrolling interest	3us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Comprehensive income (loss) attributable to Company	$ (174)nov_OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	$ 552nov_OtherComprehensiveIncomeLossNetOfTaxIncludingPortionAttributableToNoncontrollingInterest

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Other Comprehensive Income Loss Net Of Tax Including Portion Attributable to Noncontrolling Interest

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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