RECENT ACCOUNTING PRONOUCEMENTS (Details) $ in Billions	Sep. 30, 2022 USD ($)
Accounting Policies [Abstract]
Crypto-asset at fair value	$ 9.4
Crypto-asset, corresponding liability	$ 9.4

Crypto-Asset, Corresponding Liability, Fair Value Disclosure

No definition available.

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