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Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2019
Jul. 26, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Trading Symbol DNOW  
Entity Registrant Name NOW 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   108,796,897
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 001-36325  
Entity Tax Identification Number 464191184  
Entity Address, Address Line One 7402 North Eldridge Parkway  
Entity Address, City or Town Houston  
Entity Address, State or Province Texas  
Entity Address, Postal Zip Code 77041  
City Area Code 281  
Local Phone Number 823-4700