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Equity - Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Noncontrolling Interest [Line Items]        
Minimum interest in joint venture (as a percent)     20.00%  
Agreement terms, change of control, put option for minority interest ownership, effective period     15 days  
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Balance at beginning of period     $ 2,781  
Net income attributable to redeemable noncontrolling interest $ 51 $ 46 103 $ 95
Distributions payable to redeemable noncontrolling interest     (91)  
Redemption value adjustment     312  
Balance at end of period $ 3,105   $ 3,105  
CME Group        
Noncontrolling Interest [Line Items]        
Noncontrolling interest ownership by noncontrolling owners (as a percent) 27.00%   27.00%