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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($)
Sep. 29, 2023
Mar. 31, 2022
Jan. 11, 2022
Sep. 07, 2021
Aug. 06, 2021
Aug. 10, 2020
Sep. 30, 2023
Commitment And Contingencies [Line Items]              
Guarantees, Fair Value Disclosure             $ 0
Trading Technologies Matter [Member]              
Commitment And Contingencies [Line Items]              
Damages sought         $ 962,400,000    
Damage awarded   $ 490,232 $ 2,100,000 $ 6,600,000      
FINRA [Member]              
Commitment And Contingencies [Line Items]              
Settlement, penalties agreed to paid           $ 15,000,000  
SEC [Member]              
Commitment And Contingencies [Line Items]              
Settlement, penalties agreed to paid $ 35,000,000         11,500,000  
CFTC [Member]              
Commitment And Contingencies [Line Items]              
Settlement, penalties agreed to paid $ 20,000,000         11,500,000  
Disgorgement [Member]              
Commitment And Contingencies [Line Items]              
Settlement, penalties agreed to paid           $ 700,000