| Cover Page | Oct. 19, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Oct. 19, 2021 |
| Entity Registrant Name | Robinhood Markets, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40691 |
| Entity Tax Identification Number | 46-4364776 |
| Entity Address, Address Line One | 85 Willow Road |
| Entity Address, City or Town | Menlo Park |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94025 |
| City Area Code | 844 |
| Local Phone Number | 428-5411 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A Common Stock, $0.0001 par value per share |
| Trading Symbol | HOOD |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
| Entity Central Index Key | 0001783879 |
| Amendment Flag | false |
