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Acquisitions - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 05, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
NYX          
Business Acquisition [Line Items]          
Cash paid in acquisition $ 666        
Business Combination, Consideration Transferred, Shares Acquired, Fair Value 92        
Non-controlling equity interest held before acquisition $ 90        
Business Combination, Acquisition Related Costs       $ 8 $ 15
Allocated purchase price adjustment   $ 8      
Royalty rate       0.50%  
Spicerack Media [Member]          
Business Acquisition [Line Items]          
Goodwill deductible for income tax purposes     $ 13    
Minimum          
Business Acquisition [Line Items]          
Discount rate       9.00%  
Royalty rate       1.00%  
Minimum | NYX          
Business Acquisition [Line Items]          
Discount rate       10.00%  
Maximum          
Business Acquisition [Line Items]          
Discount rate       20.00%  
Royalty rate       16.00%  
Contingent acquisition consideration liabilities     $ 14    
Maximum | NYX          
Business Acquisition [Line Items]          
Discount rate       14.00%  
Business Combination | Revenue          
Business Acquisition [Line Items]          
Revenue and earnings associated with acquisitions (less than)     5.00%    
Business Combination | Earnings          
Business Acquisition [Line Items]          
Revenue and earnings associated with acquisitions (less than)       5.00%