Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Amounts attributable to S&P Global Inc. common shareholders:
Net income	$ 1,011	$ 511	$ 2,002	$ 1,305
Basic weighted-average number of common shares outstanding (shares)	313,000,000.0	319,300,000	313,300,000	320,300,000
Effect of stock options and other dilutive securities (shares)	200,000	500,000	300,000	600,000
Diluted weighted-average number of common shares outstanding (shares)	313,200,000	319,800,000	313,600,000	320,900,000
Net income:
Net income: Basic (USD per share)	$ 3.23	$ 1.60	$ 6.39	$ 4.08
Net income: Diluted (USD per share)	$ 3.23	$ 1.60	$ 6.38	$ 4.07
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