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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Loss Contingencies [Line Items]        
Period of lease extension options 12 years   12 years  
Period of options to terminate lease     1 year  
CME Group | S&P DJ Indices        
Loss Contingencies [Line Items]        
Revenues earned under license agreement $ 32 $ 28 $ 119 $ 87
CME Group        
Loss Contingencies [Line Items]        
Noncontrolling interest ownership by noncontrolling owners (as a percent) 27.00%   27.00%  
CME Group | S&P DJ Indices        
Loss Contingencies [Line Items]        
Noncontrolling interest ownership by noncontrolling owners (as a percent) 27.00%   27.00%  
Minimum        
Loss Contingencies [Line Items]        
Remaining lease terms 1 year   1 year  
Maximum        
Loss Contingencies [Line Items]        
Remaining lease terms 13 years   13 years