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Document and Entity Information
Dec. 21, 2020
Cover [Abstract]  
Entity Registrant Name NATIONAL OILWELL VARCO INC
Amendment Flag false
Entity Central Index Key 0001021860
Current Fiscal Year End Date --12-31
Document Type 8-K
Document Period End Date Dec. 21, 2020
Entity Incorporation State Country Code DE
Entity File Number 1-12317
Entity Tax Identification Number 76-0475815
Entity Address, Address Line One 7909 Parkwood Circle Drive
Entity Address, City or Town Houston
Entity Address, State or Province TX
Entity Address, Postal Zip Code 77036
City Area Code (713)
Local Phone Number 346-7500
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.01 per share
Trading Symbol NOV
Security Exchange Name NYSE
Entity Emerging Growth Company false