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ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Credit Losses of Receivables From Users (Details) - Robinhood credit - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Contract with Customer, Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 2 $ 1
Provision for credit losses 3 5
Write-offs (2) (3)
Ending balance $ 3 $ 3