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Debt - Additional Information (Details)
$ in Millions
9 Months Ended 12 Months Ended
Feb. 14, 2024
USD ($)
Feb. 09, 2024
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Feb. 07, 2024
USD ($)
Feb. 06, 2024
USD ($)
Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         $ 1,000 $ 1,500
Receivables facility     $ 170      
Line of credit facility, remaining borrowing capacity     801      
Letter of Credit            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity     150      
Receivables facility     29      
Senior notes            
Debt Instrument [Line Items]            
Expected interest expense increase, annualized amount     $ 16      
Senior notes | Forecast            
Debt Instrument [Line Items]            
Interest expense increase       $ 12    
Senior notes | S&P Global Inc.            
Debt Instrument [Line Items]            
Interest rate adjustment 0.0025          
Expected interest expense increase, annualized amount $ 8          
Senior notes | S&P Global Inc. | Forecast            
Debt Instrument [Line Items]            
Interest expense increase       6    
Senior notes | Moody's Corporation            
Debt Instrument [Line Items]            
Senior notes subject to interest rate adjustment   $ 3,100        
Interest rate adjustment   0.0025        
Expected interest expense increase, annualized amount   $ 8        
Senior notes | Moody's Corporation | Forecast            
Debt Instrument [Line Items]            
Interest expense increase       $ 6