XML 84 R68.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Employee Benefit Plans - Assumption Rates Used for Net Periodic Benefit Costs (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
United States [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate minimum | 1.20% | 2.50% | 3.90%
Discount rate maximum | 2.40% | 3.20% | 4.20%
Expected return on assets | 3.90% | 4.80% | 5.70%
Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate minimum | 0.70% | 0.00% | 1.80%
Discount rate maximum | 1.80% | 2.30% | 2.90%
Salary increase minimum | 1.75% | 1.80% | 1.80%
Salary increase maximum | 2.90% | 3.10% | 3.40%
Expected return on assets, minimum | 0.80% | 0.00% | 1.90%
Expected return on assets, maximum | 3.40% | 4.50% | 4.30%

X
- Definition Defined benefit plan assumptions used calculating net periodic benefit cost discount rate maximum. + References No definition available. + Details
Name: | nov_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRateMaximum
Namespace Prefix: | nov_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined benefit plan assumptions used calculating net periodic benefit cost discount rate minimum. + References No definition available. + Details
Name: | nov_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRateMinimum
Namespace Prefix: | nov_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined benefit plan assumptions used calculating net periodic benefit cost expected long term return on assets maximum. + References No definition available. + Details
Name: | nov_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssetsMaximum
Namespace Prefix: | nov_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined benefit plan assumptions used calculating net periodic benefit cost expected long term return on assets minimum. + References No definition available. + Details
Name: | nov_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssetsMinimum
Namespace Prefix: | nov_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined benefit plan assumptions used calculating net periodic benefit cost rate of compensation increase maximum. + References No definition available. + Details
Name: | nov_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMaximum
Namespace Prefix: | nov_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined benefit plan assumptions used calculating net periodic benefit cost rate of compensation increase. + References No definition available. + Details
Name: | nov_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncreaseMinimum
Namespace Prefix: | nov_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
Name: | us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Namespace Prefix: | us-gaap_
Data Type: | dtr-types: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_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |