RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Asset related to user cryptocurrencies safeguarding obligation	$ 8,431	$ 0
User cryptocurrencies safeguarding obligation	$ 8,431	$ 0

Platform User Crypto-Assets Safeguarding Liability, Current

No definition available.

Name:	hood_PlatformUserCryptoAssetsSafeguardingLiabilityCurrent
Namespace Prefix:	hood_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant