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Business Segments and Geographic Areas - Revenues by Country Based on Sales Destination of Use of Products or Services (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 5,709us-gaap_SalesRevenueNet	$ 5,587us-gaap_SalesRevenueNet	$ 5,255us-gaap_SalesRevenueNet	$ 4,889us-gaap_SalesRevenueNet	$ 5,302us-gaap_SalesRevenueNet	$ 4,863us-gaap_SalesRevenueNet	$ 4,680us-gaap_SalesRevenueNet	$ 4,376us-gaap_SalesRevenueNet	$ 21,440us-gaap_SalesRevenueNet	$ 19,221us-gaap_SalesRevenueNet	$ 17,194us-gaap_SalesRevenueNet
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									6,097us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	5,140us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	6,040us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									3,472us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = currency_KRW	3,219us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = currency_KRW	3,121us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = currency_KRW
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,905us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN	1,007us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN	533us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CN
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,299us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_BR	811us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_BR	503us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_BR
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,157us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_SG	1,850us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_SG	1,118us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_SG
Norway [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									881us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = currency_NOK	1,102us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = currency_NOK	736us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = currency_NOK
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									715us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB	705us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB	523us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									645us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA	625us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA	728us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 5,269us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = nov_OtherCountriesMember	$ 4,762us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = nov_OtherCountriesMember	$ 3,892us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = nov_OtherCountriesMember

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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