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Cash and Securities Segregated Under Federal Regulations and Other Requirements
 12 Months Ended
Dec. 31, 2023
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 December 31, 2023 and 2022, $0.9 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.