Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue	$ 2,016	$ 1,786
Expenses:
Operating-related expenses	527	518
Selling and general expenses	360	314
Depreciation	19	20
Amortization of intangibles	31	29
Total expenses	937	881
Gain on dispositions	(2)	(7)
Operating profit	1,081	912
Other (income) expense, net	(7)	1
Interest expense, net	32	34
Income before taxes on income	1,056	877
Provision for taxes on income	248	188
Net income	808	689
Less: net income attributable to noncontrolling interests	(53)	(50)
Net income attributable to S&P Global Inc.	$ 755	$ 639
Net income:
Basic (USD per share)	$ 3.14	$ 2.64
Diluted (USD per share)	$ 3.12	$ 2.62
Weighted-average number of common shares outstanding:
Basic (shares)	240.6	242.1
Diluted (shares)	241.6	243.3
Actual shares outstanding at period end (shares)	240.9	240.9