XML 106 R90.htm IDEA: XBRL DOCUMENT v3.8.0.1

Business Segments and Geographic Areas - Revenues by Country Based on Sales Destination of Products or Services (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,969	$ 1,835	$ 1,759	$ 1,741	$ 1,692	$ 1,646	$ 1,724	$ 2,189	$ 7,304	$ 7,251	$ 14,757
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									2,760	1,961	3,640
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									498	242	605
Saudi Arabia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									310	258	416
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									298	557	1,623
Norway [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									295	339	555
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									286	217	365
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									279	299	634
South Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									261	495	1,835
United Arab Emirates [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									223	334	532
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									188	340	1,035
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 1,906	$ 2,209	$ 3,517

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_BR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_SA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_CN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=currency_NOK
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_GB
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=currency_KRW
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_AE
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_SG
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=nov_OtherCountriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: