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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Loss Contingencies [Line Items]          
Period of lease extension options   12 years   12 years  
Period of options to terminate lease       1 year  
Contribution to noncontrolling interest       $ 59 $ 78
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   $ 30 $ 24 $ 59 $ 55
Noncontrolling interest ownership by noncontrolling owners (as a percent)   27.00%   27.00%  
Minimum          
Loss Contingencies [Line Items]          
Remaining lease terms       1 year  
Maximum          
Loss Contingencies [Line Items]          
Remaining lease terms       14 years