Debt - Additional Information (Details) $ in Millions					12 Months Ended
	Feb. 14, 2024 USD ($)	Feb. 09, 2024 USD ($)	Aug. 21, 2023 USD ($)	Aug. 03, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Feb. 08, 2024 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Unamortized deferred debt issue costs						$ 24		$ 30
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						1,500
Proceeds from lines of credit						150
Receivables facility						131
Line of credit facility, remaining borrowing capacity						1,300
Revolving credit facility | Subsequent Event
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 1,000					$ 1,500
Letter of Credit
Debt Instrument [Line Items]
Receivables facility						20
Senior notes
Debt Instrument [Line Items]
Expected interest rate adjustment				$ 15
Interest rate adjustment, annualized amount						8
Receivables facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						375
Receivables facility						0		$ 35
S&P Global Inc. | Senior notes
Debt Instrument [Line Items]
Senior notes subject to interest rate adjustment			$ 3,100
Interest rate adjustment			25	50
Interest expense, long-term debt, increase (decrease)			$ 39
S&P Global Inc. | Senior notes | Subsequent Event
Debt Instrument [Line Items]
Interest rate adjustment	25	25
Moody's Corporation | Senior notes
Debt Instrument [Line Items]
Expected interest rate adjustment			8
Interest rate adjustment, annualized amount						$ 2
Interest expense, long-term debt, increase (decrease)			$ 39
Moody's Corporation | Senior notes | Forecast
Debt Instrument [Line Items]
Interest expense, long-term debt, increase (decrease)					$ 6
Moody's Corporation | Senior notes | Subsequent Event
Debt Instrument [Line Items]
Interest expense, long-term debt, increase (decrease)	$ 8	$ 8