XML 106 R90.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Income Taxes - Summary of Net Operating Loss Carryforwards (Detail) $ in Millions | Dec. 31, 2021 USD ($)
--- | ---
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | $ 2,213
Tax Effected NOL | 446
Federal [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 555
Tax Effected NOL | 117
State [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 387
Tax Effected NOL | 25
Foreign [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 1,271
Tax Effected NOL | 304
2021 - 2025 Expiration [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 267
2021 - 2025 Expiration [Member] | Federal [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 19
2021 - 2025 Expiration [Member] | State [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 4
2021 - 2025 Expiration [Member] | Foreign [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 244
2026 - 2040 Expiration [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 795
2026 - 2040 Expiration [Member] | Federal [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 31
2026 - 2040 Expiration [Member] | State [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 383
2026 - 2040 Expiration [Member] | Foreign [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 381
Unlimited Expiration [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 1,151
Unlimited Expiration [Member] | Federal [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | 505
Unlimited Expiration [Member] | Foreign [Member] |
Operating Loss Carryforwards [Line Items] |
Total Net Operating Loss (NOL) | $ 646

X
- Definition Operating loss carryforward tax effected. + References No definition available. + Details
Name: | nov_OperatingLossCarryforwardTaxEffected
Namespace Prefix: | nov_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=nov_OperatingLossCarryforwardsExpirationPeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=nov_OperatingLossCarryforwardsExpirationPeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=nov_OperatingLossCarryforwardNoExpirationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |