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ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses of Receivables From Users (Details)
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
Credit Loss [Abstract]  
Contract with customer, threshold period 180 days
Robinhood credit  
Contract with Customer, Receivable, Allowance for Credit Loss [Roll Forward]  
Beginning balance $ 1
Provision for credit losses 2
Write-offs (1)
Ending balance $ 2