XML 73 R59.htm IDEA: XBRL DOCUMENT v3.21.2
Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Loss Contingencies [Line Items]        
Period of lease extension options 12 years   12 years  
Option to terminate lease, period     1 year  
Lease impairment     $ 3  
CME Group        
Loss Contingencies [Line Items]        
Noncontrolling interest ownership by noncontrolling owners (as a percent) 27.00%   27.00%  
S&P DJ Indices | CME Group        
Loss Contingencies [Line Items]        
Noncontrolling interest ownership by noncontrolling owners (as a percent) 27.00%   27.00%  
S&P DJ Indices | CME Group        
Loss Contingencies [Line Items]        
Revenues earned under license agreement $ 34 $ 32 $ 102 $ 119
Minimum        
Loss Contingencies [Line Items]        
Remaining lease terms 1 year   1 year  
Maximum        
Loss Contingencies [Line Items]        
Remaining lease terms 12 years   12 years