Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Amounts attributable to S&P Global Inc. common shareholders:
Net income	$ 971	$ 742	$ 2,972	$ 2,047
Basic weighted-average number of common shares outstanding (shares)	311,200,000	317,500,000	312,600,000	319,400,000
Effect of dilutive securities (shares)	300,000	500,000	300,000	500,000
Diluted weighted-average number of common shares outstanding (shares)	311,500,000	318,000,000.0	312,900,000	319,900,000
Net income:
Net income: Basic (USD per share)	$ 3.12	$ 2.34	$ 9.51	$ 6.41
Net income: Diluted (USD per share)	$ 3.11	$ 2.33	$ 9.50	$ 6.40
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of diluted earnings (shares)	0	0	0	0
Restricted Stock and Unit Awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of diluted earnings (shares)			900,000	800,000