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Common Stock - Summary of Stock Option Outstanding Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Weighted-Avg Remaining Contractual Life	6 years 8 months 19 days
Stock Options Outstanding, Shares	10,881,133us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Stock Options Outstanding, Weighted - Average Exercise Price	$ 61.22nov_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlanExercisePriceRangeOutstandingOptionsWeightedAverageExercisePrice
Stock Options Exercisable, Shares	5,903,712us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Stock Options Exercisable, Weighted - Average Exercise Price	$ 55.06nov_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlanExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice
Stock option, Minimum Range	$ 8.43us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Stock option, Maximum Range	$ 77.99us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Weighted-Avg Remaining Contractual Life	3 years 5 months 27 days
Stock Options Outstanding, Shares	2,428,973us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeOneMember
Stock Options Outstanding, Weighted - Average Exercise Price	$ 32.39nov_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlanExercisePriceRangeOutstandingOptionsWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeOneMember
Stock Options Exercisable, Shares	2,428,973us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeOneMember
Stock Options Exercisable, Weighted - Average Exercise Price	$ 32.39nov_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlanExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeOneMember
Stock option, Minimum Range	$ 8.43us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeOneMember
Stock option, Maximum Range	$ 45.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeOneMember
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Weighted-Avg Remaining Contractual Life	8 years 2 months 9 days
Stock Options Outstanding, Shares	5,458,369us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeTwoMember
Stock Options Outstanding, Weighted - Average Exercise Price	$ 65.94nov_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlanExercisePriceRangeOutstandingOptionsWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeTwoMember
Stock Options Exercisable, Shares	1,102,784us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeTwoMember
Stock Options Exercisable, Weighted - Average Exercise Price	$ 61.06nov_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlanExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeTwoMember
Stock option, Minimum Range	$ 45.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeTwoMember
Stock option, Maximum Range	$ 70.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeTwoMember
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Weighted-Avg Remaining Contractual Life	6 years 8 months 5 days
Stock Options Outstanding, Shares	2,993,791us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeThreeMember
Stock Options Outstanding, Weighted - Average Exercise Price	$ 75.99nov_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlanExercisePriceRangeOutstandingOptionsWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeThreeMember
Stock Options Exercisable, Shares	2,371,955us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeThreeMember
Stock Options Exercisable, Weighted - Average Exercise Price	$ 75.49nov_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlanExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeThreeMember
Stock option, Minimum Range	$ 70.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeThreeMember
Stock option, Maximum Range	$ 77.99us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = nov_RangeThreeMember

X

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Share-based compensation shares authorized under stock option plan exercise price range exercisable options weighted average exercise price.

+ References

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Share-based compensation shares authorized under stock option plan exercise price range outstanding options weighted average exercise price.

+ References

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- Definition

Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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-Name Accounting Standards Codification

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

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