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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, 2021	Dec. 31, 2020	Dec. 31, 2019
Total	$ 157,949.6	$ 86,781.8	$ 37,077.0
Cash [Member]
Performance bonds	151,094.8	83,923.5
Guaranty Fund Contributions	6,745.6	2,770.0
Cross-margin arrangements	83.6	88.1
Performance collateral for delivery	25.6	0.2
Total	157,949.6	86,781.8
Non-Cash Deposits and IEF Funds [Member]
Performance bonds	70,005.3	124,573.7
Guaranty Fund Contributions	3,326.1	6,015.7
Cross-margin arrangements	0.0	8.1
Performance collateral for delivery	2.1	2.1
Total	$ 73,333.5	$ 130,599.6