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Cash and Securities Segregated Under Federal Regulations and Other Requirements
6 Months Ended
Jun. 30, 2022
Broker-Dealer [Abstract]  
Cash and Securities Segregated Under Federal Regulations and Other Requirements Cash and Securities Segregated Under Federal Regulations and Other Requirements As of June 30, 2022 and December 31, 2021, $1.7 billion and $1.5 billion, respectively, of U.S. Treasury Bills were segregated in a special reserve bank custody account for the exclusive benefit of our brokerage customers under Rule 15c3-3 of the Exchange Act.