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Performance Bonds and Guaranty Fund Contributions (Cash and Securities Held as Performance Bonds and Guaranty Fund Contributions at Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Total $ 90,192.5 $ 135,249.2 $ 157,949.6
Cash [Member]      
Performance bonds 87,285.5 132,653.7  
Guaranty Fund Contributions 2,379.6 2,450.3  
Cross-margin arrangements 183.1 142.6  
Performance collateral for delivery 344.3 2.6  
Total 90,192.5 135,249.2  
Non-Cash Deposits and IEF Funds [Member]      
Performance bonds 180,866.3 94,127.2  
Guaranty Fund Contributions 6,849.6 5,026.0  
Cross-margin arrangements 1,374.5 561.1  
Performance collateral for delivery 2.1 2.1  
Total $ 189,092.5 $ 99,716.4