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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]          
Period of lease extension options   12 years      
Period of options to terminate lease   1 year      
Affiliated Entity          
Loss Contingencies [Line Items]          
Contribution to noncontrolling interest $ 20        
CME Group | S&P/DJ Indices          
Loss Contingencies [Line Items]          
Revenues earned under license agreement     $ 114 $ 121 $ 74
CME Group          
Loss Contingencies [Line Items]          
Noncontrolling interest ownership by noncontrolling owners (as a percent)     27.00%    
CME Group | S&P/DJ Indices          
Loss Contingencies [Line Items]          
Noncontrolling interest ownership by noncontrolling owners (as a percent)     27.00%    
Minimum          
Loss Contingencies [Line Items]          
Remaining lease terms   1 year      
Maximum          
Loss Contingencies [Line Items]          
Remaining lease terms   14 years