Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Amounts attributable to S&P Global Inc. common shareholders:
Net income	$ 1,072	$ 1,011	$ 2,161	$ 2,002
Basic weighted-average number of common shares outstanding (shares)	305,900,000	313,000,000.0	306,600,000	313,300,000
Effect of dilutive securities (shares)	200,000	200,000	300,000	300,000
Diluted weighted-average number of common shares outstanding (shares)	306,100,000	313,200,000	306,900,000	313,600,000
Net income:
Basic (USD per share)	$ 3.50	$ 3.23	$ 7.05	$ 6.39
Diluted (USD per share)	$ 3.50	$ 3.23	$ 7.04	$ 6.38
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)			700,000	900,000