v3.25.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2025
Jul. 30, 2025
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Trading Symbol DNOW  
Security Exchange Name NYSE  
Entity Registrant Name DNOW INC.  
Entity Central Index Key 0001599617  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   105,011,966
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 001-36325  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 46-4191184  
Entity Address, Address Line One 7402 North Eldridge Parkway  
Entity Address, City or Town Houston  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77041  
City Area Code 281  
Local Phone Number 823-4700  
Title of 12(b) Security Common Stock, par value $0.01  
Entity Interactive Data Current Yes  
Document Quarterly Report true  
Document Transition Report false