COVER - USD ($)	12 Months Ended
	Dec. 31, 2021	Feb. 18, 2022
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-40691
Entity Registrant Name	Robinhood Markets, Inc.
Entity Incorporation, State	DE
Entity Tax Identification Number	46-4364776
Entity Address, Street	85 Willow Rd
Entity Address, City	Menlo Park
Entity Address, State	CA
Entity Address, Postal Zip Code	94025
City Area Code	844
Local Phone Number	428-5411
Title of each class	Class A Common Stock - $0.0001 par value per share
Trading Symbol(s)	HOOD
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Documents Incorporated by Reference	The information required by Part III of this Report, to the extent not set forth herein, is incorporated herein by reference from the registrant’s definitive proxy statement relating to the Annual Meeting of Stockholders to be held in 2022, which definitive proxy statement shall be filed with the Securities and Exchange Commission within 120 days after the end of the fiscal year to which this Report relates.
Entity Central Index Key	0001783879
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Public Float	$ 0
Common Class A
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		740,034,469
Common Class B
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		127,955,246