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Commitments and Contingencies - Narrative (Details)
$ in Millions
3 Months Ended
Feb. 28, 2022
USD ($)
Feb. 02, 2021
plaintiff
Mar. 31, 2022
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Loss Contingencies [Line Items]          
Period of lease extension options     15 years    
Option to terminate lease, period     1 year    
Lease impairment       $ 5  
Basis Capital Investment Group, Investment Losses On Collateralized Debt Obligations          
Loss Contingencies [Line Items]          
Loss Contingency, Number of Plaintiffs | plaintiff   2      
IHS Markit          
Loss Contingencies [Line Items]          
Increase in ROU assets $ 230        
Increase in operating lease liabilities $ 268        
CME Group          
Loss Contingencies [Line Items]          
Noncontrolling interest ownership by noncontrolling owners (as a percent)     27.00%    
S&P DJ Indices | CME Group          
Loss Contingencies [Line Items]          
Noncontrolling interest ownership by noncontrolling owners (as a percent)     27.00%    
S&P DJ Indices | CME Group          
Loss Contingencies [Line Items]          
Revenues earned under license agreement       $ 41 $ 37
Minimum          
Loss Contingencies [Line Items]          
Remaining lease terms     1 year    
Maximum          
Loss Contingencies [Line Items]          
Remaining lease terms     11 years