Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenue	$ 1,571	$ 1,567
Expenses:
Operating-related expenses	439	430
Selling and general expenses	375	381
Depreciation	20	21
Amortization of intangibles	32	24
Total expenses	866	856
Operating profit	705	711
Other expense (income), net	103	(4)
Interest expense, net	36	34
Income before taxes on income	566	681
Provision for taxes on income	113	147
Net income	453	534
Less: net income attributable to noncontrolling interests	(43)	(43)
Net income attributable to S&P Global Inc.	$ 410	$ 491
Net income:
Basic (USD per share)	$ 1.66	$ 1.94
Diluted (USD per share)	$ 1.65	$ 1.93
Weighted-average number of common shares outstanding:
Basic (shares)	246.7	252.4
Diluted (shares)	248.3	254.4
Actual shares outstanding at period end (shares)	246.1	249.4
Dividend declared per common share (USD per share)	$ 0.57	$ 0.5