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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 03, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Trading Symbol NOV    
Entity Registrant Name NOV INC.    
Entity Central Index Key 0001021860    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   394,003,549  
Entity Public Float     $ 6.3
Entity Small Business false    
Entity Emerging Growth Company false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag true    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Security Exchange Name NYSE    
Entity File Number 1-12317    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 76-0475815    
Entity Address, Address Line One 10353 Richmond Avenue    
Entity Address, City or Town Houston    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77042-4103    
City Area Code 346    
Local Phone Number 223-3000    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference [Text Block]

Portions of the Proxy Statement in connection with the 2024 Annual Meeting of Stockholders are incorporated in Part III of this report.

    
Auditor Firm ID 42    
Auditor Name Ernst & Young LLP    
Auditor Location Houston, Texas