v3.26.1
COVER - shares
 6 Months Ended
Jun. 30, 2026
Jul. 28, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
Document Transition Report false  
Entity File Number 001-39253  
Entity Registrant Name Opendoor Technologies Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 30-1318214  
Entity Address, Address Line One 1295 West Washington Street,  
Entity Address, Address Line Two Suite 115  
Entity Address, City or Town Tempe,  
Entity Address, State or Province AZ  
Entity Address, Postal Zip Code 85288  
City Area Code 480  
Local Phone Number 618-6760  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   971,091,050
Entity Central Index Key 0001801169  
Amendment Flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Common stock, $0.0001 par value per share    
Document Information [Line Items]    
Title of 12(b) Security Common stock, $0.0001 par value per share  
Trading Symbol OPEN  
Security Exchange Name NASDAQ  
Series K Warrants, each whole warrant exercisable to purchase one share of common stock at an exercise price of $9.00 per warrant    
Document Information [Line Items]    
Title of 12(b) Security Series K Warrants, each whole warrant exercisable to purchase one share of common stock at an exercise price of $9.00 per warrant  
Trading Symbol OPENW  
Security Exchange Name NASDAQ  
Series A Warrants, each whole warrant exercisable to purchase one share of common stock at an exercise price of $13.00 per warrant    
Document Information [Line Items]    
Title of 12(b) Security Series A Warrants, each whole warrant exercisable to purchase one share of common stock at an exercise price of $13.00 per warrant  
Trading Symbol OPENL  
Security Exchange Name NASDAQ  
Series Z Warrants, each whole warrant exercisable to purchase one share of common stock at an exercise price of $17.00 per warrant    
Document Information [Line Items]    
Title of 12(b) Security Series Z Warrants, each whole warrant exercisable to purchase one share of common stock at an exercise price of $17.00 per warrant  
Trading Symbol OPENZ  
Security Exchange Name NASDAQ