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Commitments and Contingencies - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 02, 2021
plaintiff
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Loss Contingencies [Line Items]          
Period of lease extension options   15 years   15 years  
Option to terminate lease, period       1 year  
Revenue   $ 3,549 $ 3,101 $ 7,040 $ 6,261
Basis Capital Investment Group, Investment Losses on Collateralized Debt Obligations          
Loss Contingencies [Line Items]          
Number of entities | plaintiff 2        
CME Group          
Loss Contingencies [Line Items]          
Noncontrolling interest ownership by noncontrolling owners percentage   27.00%   27.00%  
S&P DJ Indices | CME Group          
Loss Contingencies [Line Items]          
Noncontrolling interest ownership by noncontrolling owners percentage   27.00%   27.00%  
S&P DJ Indices | Related Party          
Loss Contingencies [Line Items]          
Revenue   $ 48 $ 45 $ 96 $ 89
Minimum          
Loss Contingencies [Line Items]          
Remaining lease terms   1 year   1 year  
Maximum          
Loss Contingencies [Line Items]          
Remaining lease terms   11 years   11 years