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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, 2025
Dec. 31, 2024
2025 Restructuring Plan    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded $ 33  
Ending Reserve Balance 31  
2025 Restructuring Plan | Operating Segments | Market Intelligence    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 14  
Ending Reserve Balance 13  
2025 Restructuring Plan | Operating Segments | Ratings    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 2  
Ending Reserve Balance 1  
2025 Restructuring Plan | Operating Segments | Commodity Insights    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 6  
Ending Reserve Balance 6  
2025 Restructuring Plan | Operating Segments | Mobility    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 0  
Ending Reserve Balance 0  
2025 Restructuring Plan | Operating Segments | Indices    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 0  
Ending Reserve Balance 0  
2025 Restructuring Plan | Corporate    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 11  
Ending Reserve Balance 11  
2024 Restructuring Plan    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 125  
Ending Reserve Balance 55 $ 88
2024 Restructuring Plan | Operating Segments | Market Intelligence    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 77  
Ending Reserve Balance 26  
2024 Restructuring Plan | Operating Segments | Ratings    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 4  
Ending Reserve Balance 2  
2024 Restructuring Plan | Operating Segments | Commodity Insights    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 13  
Ending Reserve Balance 6  
2024 Restructuring Plan | Operating Segments | Mobility    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 6  
Ending Reserve Balance 2  
2024 Restructuring Plan | Operating Segments | Indices    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 1  
Ending Reserve Balance 0  
2024 Restructuring Plan | Corporate    
Restructuring Cost and Reserve [Line Items]    
Initial Charge Recorded 24  
Ending Reserve Balance $ 19