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Debt - Additional Information (Details)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 14, 2024
USD ($)
Feb. 09, 2024
USD ($)
Mar. 31, 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
Proceeds from lines of credit     $ 150      
Receivables facility     231      
Line of credit facility, remaining borrowing capacity     749      
Letter of Credit            
Debt Instrument [Line Items]            
Receivables facility     20      
Senior notes            
Debt Instrument [Line Items]            
Interest expense, long-term debt, increase (decrease)     $ 16      
Senior notes | Forecast            
Debt Instrument [Line Items]            
Interest expense, long-term debt, increase (decrease)       $ 12    
S&P Global Inc. | Senior notes            
Debt Instrument [Line Items]            
Senior notes subject to interest rate adjustment   $ 3,100        
Interest rate adjustment 0.0025 0.0025        
Moody's Corporation | Senior notes            
Debt Instrument [Line Items]            
Interest expense, long-term debt, increase (decrease) $ 8 $ 8        
Moody's Corporation | Senior notes | Forecast            
Debt Instrument [Line Items]            
Interest expense, long-term debt, increase (decrease)       $ 6