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Restructuring - Summary (Details) - 2018 Restructuring Plan - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded $ 25  
Ending Reserve Balance 19 $ 24
Operating Segments | Ratings    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 8  
Ending Reserve Balance 7  
Operating Segments | Market Intelligence    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 7  
Ending Reserve Balance 5  
Corporate    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 10  
Ending Reserve Balance $ 7