XML 84 R68.htm IDEA: XBRL DOCUMENT v3.6.0.2

Employee Benefit Plans - Assumption Rates Used for Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
United States Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate minimum	3.10%	3.40%
Discount rate maximum	4.00%	3.90%
International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate minimum	1.80%	2.10%
Discount rate maximum	2.80%	3.60%
Salary increase minimum	1.80%	2.00%
Salary increase maximum	3.50%	4.20%

X

- Definition

Defined benefit plan assumptions used calculating benefit obligation discount rate maximum.

+ References

No definition available.

+ Details

Name:	nov_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRateMaximum
Namespace Prefix:	nov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined benefit plan assumptions used calculating benefit obligation discount rate minimum.

+ References

No definition available.

+ Details

Name:	nov_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRateMinimum
Namespace Prefix:	nov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined benefit plan assumptions used calculating benefit obligation rate of compensation increase maximum.

+ References

No definition available.

+ Details

Name:	nov_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncreaseMaximum
Namespace Prefix:	nov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined benefit plan assumptions used calculating benefit obligation rate of compensation increase minimum.

+ References

No definition available.

+ Details

Name:	nov_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncreaseMinimum
Namespace Prefix:	nov_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

X

- Details

Name:	us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_ForeignPensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: