Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 1,943	$ 1,704	$ 3,729	$ 3,275
Expenses:
Operating-related expenses	493	471	1,014	944
Selling and general expenses	295	368	606	709
Depreciation	19	21	39	41
Amortization of intangibles	32	31	61	63
Total expenses	839	891	1,720	1,757
Gain on disposition	(1)	0	(8)	0
Operating profit	1,105	813	2,017	1,518
Other (income) expense, net	(10)	(6)	(9)	97
Interest expense, net	40	37	74	73
Income before taxes on income	1,075	782	1,952	1,348
Provision for taxes on income	233	180	421	293
Net income	842	602	1,531	1,055
Less: net income attributable to noncontrolling interests	(50)	(47)	(100)	(90)
Net income attributable to S&P Global Inc.	$ 792	$ 555	$ 1,431	$ 965
Net income:
Basic (USD per share)	$ 3.29	$ 2.25	$ 5.92	$ 3.92
Diluted (USD per share)	$ 3.28	$ 2.24	$ 5.90	$ 3.89
Weighted-average number of common shares outstanding:
Basic (shares)	240.9	246.1	241.5	246.4
Diluted (shares)	241.9	247.4	242.6	247.9
Actual shares outstanding at period end (shares)	241.0	246.3	241.0	246.3