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Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended
Apr. 30, 2018
Jan. 31, 2018
Jun. 30, 2017
Apr. 30, 2017
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]        
Assets held-for-sale       $ 5
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%    
CARE Ratings Limited        
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]        
Cost method investment, ownership (as a percent)     8.90%