BUSINESS COMBINATIONS - Schedule of Components of Identifiable Intangible Assets Acquired (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jul. 03, 2023
Robinhood credit
Acquired Indefinite-lived Intangible Assets [Line Items]
Fair Value		$ 36
Developed technology
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	3 years 1 month 9 days
Developed technology | Robinhood credit
Acquired Indefinite-lived Intangible Assets [Line Items]
Fair Value		$ 25
Useful Life		4 years
Customer relationships
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	7 years 3 months 14 days
Customer relationships | Robinhood credit
Acquired Indefinite-lived Intangible Assets [Line Items]
Fair Value		$ 10
Useful Life		7 years
Trade name
Acquired Indefinite-lived Intangible Assets [Line Items]
Useful Life	9 months 10 days
Trade name | Robinhood credit
Acquired Indefinite-lived Intangible Assets [Line Items]
Fair Value		$ 1
Useful Life		1 year