| Document and Entity Information | Nov. 14, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 14, 2023 |
| Entity File Number | 001-39253 |
| Entity Registrant Name | Opendoor Technologies Inc. |
| Entity Central Index Key | 0001801169 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 30-1318214 |
| Entity Address, Address Line One | 410 N. Scottsdale Road, Suite 1600 |
| 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 |
| Title of 12(b) Security | Common stock, $0.0001 par value per share |
| Trading Symbol | OPEN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
