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Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended
Apr. 30, 2018
Aug. 31, 2018
Jan. 31, 2018
Aug. 31, 2017
Jun. 30, 2017
Apr. 30, 2017
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]            
Assets held-for-sale           $ 5
FiscalNote            
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]            
Cost method investment, ownership (as a percent)   5.03%        
Kensho            
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]            
Consideration transferred to acquire business $ 550          
Pragmatix            
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]            
Equity method investment, ownership (as a percent)     100.00%      
Algomi Limited            
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]            
Cost method investment, ownership (as a percent)       6.02%    
CARE Ratings Limited            
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]            
Cost method investment, ownership (as a percent)         8.90%