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Restructuring - Schedule of Initial Restructuring Charge Recorded and the Ending Reserve Balance (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
2024 Restructuring Plan    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded $ 35  
Ending Reserve Balance 28  
2024 Restructuring Plan | Operating Segments | Market Intelligence    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 31  
Ending Reserve Balance 24  
2024 Restructuring Plan | Operating Segments | Ratings    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 1  
Ending Reserve Balance 1  
2024 Restructuring Plan | Operating Segments | Commodity Insights    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 0  
Ending Reserve Balance 0  
2024 Restructuring Plan | Operating Segments | Mobility    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 0  
Ending Reserve Balance 0  
2024 Restructuring Plan | Operating Segments | Indices    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 1  
Ending Reserve Balance 1  
2024 Restructuring Plan | Corporate    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 2  
Ending Reserve Balance 2  
2023 Restructuring Plan    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 183  
Ending Reserve Balance 83 $ 152
2023 Restructuring Plan | Operating Segments | Market Intelligence    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 90  
Ending Reserve Balance 41  
2023 Restructuring Plan | Operating Segments | Ratings    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 10  
Ending Reserve Balance 5  
2023 Restructuring Plan | Operating Segments | Commodity Insights    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 26  
Ending Reserve Balance 12  
2023 Restructuring Plan | Operating Segments | Mobility    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 9  
Ending Reserve Balance 5  
2023 Restructuring Plan | Operating Segments | Indices    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 5  
Ending Reserve Balance 2  
2023 Restructuring Plan | Corporate    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 43  
Ending Reserve Balance $ 18