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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]      
Period of lease extension options 12 years    
Period of options to terminate lease 1 year    
Lease impairment charges $ 120 $ 11 $ 11
CME Group      
Loss Contingencies [Line Items]      
Noncontrolling interest ownership by noncontrolling owners (as a percent) 27.00%    
S&P/DJ Indices | CME Group      
Loss Contingencies [Line Items]      
Noncontrolling interest ownership by noncontrolling owners (as a percent) 27.00%    
S&P/DJ Indices | CME Group      
Loss Contingencies [Line Items]      
Revenues earned under license agreement $ 149 $ 114 $ 121
Minimum      
Loss Contingencies [Line Items]      
Lease terms 1 year    
Maximum      
Loss Contingencies [Line Items]      
Lease terms 12 years