Earnings per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of Calculation for Basic and Diluted Earnings per Share

The calculation for basic and diluted EPS is as follows:

(in millions, except per share data)	Year Ended December 31,
	2017		2016		2015
Amount attributable to S&P Global Inc. common shareholders:
Net income	$	1,496	$	2,106	$	1,156
Basic weighted-average number of common shares outstanding	256.3		262.8		271.6
Effect of stock options and other dilutive securities	2.6		2.4		3.0
Diluted weighted-average number of common shares outstanding	258.9		265.2		274.6
Earnings per share attributable to S&P Global Inc. common shareholders:
Net income:
Basic	$	5.84	$	8.02	$	4.26
Diluted	$	5.78	$	7.94	$	4.21