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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($)
Jan. 11, 2022
Sep. 07, 2021
Aug. 06, 2021
Aug. 10, 2020
Dec. 31, 2021
Commitment And Contingencies [Line Items]          
Damage awarded   $ 6,600,000      
Guarantees, Fair Value Disclosure         $ 0
Trading Technologies Matter [Member]          
Commitment And Contingencies [Line Items]          
Damages sought     $ 962,400,000    
Trading Technologies Matter [Member] | Subsequent Event [Member]          
Commitment And Contingencies [Line Items]          
Damage awarded $ 2,100,000        
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       11,500,000  
CFTC [Member]          
Commitment And Contingencies [Line Items]          
Settlement, penalties agreed to paid       11,500,000  
Disgorgement [Member]          
Commitment And Contingencies [Line Items]          
Settlement, penalties agreed to paid       $ 700,000