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Equity - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Jan. 29, 2020
Dec. 04, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock repurchased during period (shares) 400,000   3,000,000 4,000,000.0 5,400,000    
Payments for repurchase of stock   $ 1,164   $ 1,164 $ 1,144    
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      
2020 Repurchase Program              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Authorized for repurchase (shares)           30,000,000  
Shares authorized for repurchase, compared to total common stock outstanding (as a percent)           12.00%  
Remaining shares available under repurchase program (shares)       30,000,000      
Payments for repurchase of stock       $ 1,161      
2013 Repurchase Program              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Authorized for repurchase (shares)             50,000,000
Shares authorized for repurchase, compared to total common stock outstanding (as a percent)             18.00%
Remaining shares available under repurchase program (shares)       800,000      
CME Group              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Noncontrolling interest ownership by noncontrolling owners (as a percent)       27.00%