Earnings per Share - (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amount attributable to S&P Global Inc. common shareholders:
Net income	$ 3,852	$ 2,626	$ 3,248
Basic weighted-average number of common shares outstanding (in shares)	311,600,000	318,400,000	316,900,000
Effect of dilutive securities (in shares)	300,000	500,000	1,600,000
Diluted weighted-average number of common shares outstanding (in shares)	311,900,000	318,900,000	318,500,000
Net income:
Basic (in USD)	$ 12.36	$ 8.25	$ 10.25
Diluted (in USD)	$ 12.35	$ 8.23	$ 10.20
Restricted Performance Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of diluted EPS (in shares)	500,000	700,000	600,000
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from computation of diluted EPS (in shares)	0	0	0