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Clearing Operations (Schedule of Clearing Member Default Fund Contributions And Margin Deposits) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Clearing Operations [Line Items]    
Default fund contributions $ 1,460  
Margin deposits 13,359  
Total 14,819  
Cash Contributions    
Clearing Operations [Line Items]    
Default fund contributions 1,345  
Margin deposits 5,676  
Total 7,021 $ 5,911
Non-Cash Contributions    
Clearing Operations [Line Items]    
Default fund contributions 115  
Margin deposits 7,683  
Total $ 7,798