XML 109 R93.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Spin-off of Distribution Business - Additional Information (Detail) - Now Inc [Member] $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
May. 30, 2014 USD ($) | May. 22, 2014 | Dec. 31, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Ratio of common stock sharing |  | 4 |
Other costs |  |  | $ 36
Sales prior to the spin-off | $ 231 |  |
Purchases prior to the spin-off | $ 82 |  |

X
- Definition For a disposal group that is a component of the entity (discontinued operation), in the period in which the operations are initially classified as discontinued, the amounts of intercompany costs that were previously eliminated in consolidation for periods before the disposal transaction (in situations where revenue and cost producing activities with the disposed component will continue after disposal). + References No definition available. + Details
Name: | nov_DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionCosts1
Namespace Prefix: | nov_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition For a disposal group that is a component of the entity (discontinued operation), in the period in which the operations are initially classified as discontinued, the amounts of intercompany revenue that were previously eliminated in consolidation for periods before the disposal transaction (in situations where revenue and cost producing activities with the disposed component will continue after disposal). + References No definition available. + Details
Name: | nov_DiscontinuedOperationIntercompanyAmountsWithDiscontinuedOperationBeforeDisposalTransactionRevenue1
Namespace Prefix: | nov_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Share Exchange Ratio In Spin Off + References No definition available. + Details
Name: | nov_ShareExchangeRatioInSpinOff
Namespace Prefix: | nov_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Spinoff Related Transaction Costs + References No definition available. + Details
Name: | nov_SpinoffRelatedTransactionCosts
Namespace Prefix: | nov_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=nov_NowIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |