Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Amounts attributable to McGraw Hill Financial, Inc. common shareholders:
Income from continuing operations	$ 252	$ 188	$ 909	$ 716
Income from discontinued operations	0	2	0	15
Net income	$ 252	$ 190	$ 909	$ 731
Basic weighted-average number of common shares outstanding (in shares)	271,300,000	270,900,000	272,600,000	271,400,000
Effect of stock options and other dilutive securities (in shares)	3,100,000	4,500,000	2,800,000	4,800,000
Diluted weighted-average number of common shares outstanding (in shares)	274,400,000	275,400,000	275,400,000	276,200,000
Income from continuing operations:
Basic (in dollars per share)	$ 0.93	$ 0.69	$ 3.33	$ 2.64
Diluted (in dollars per share)	0.92	0.68	3.30	2.59
Income from discontinued operations:
Basic (in dollars per share)	0.00	0.01	0.00	0.05
Diluted (in dollars per share)	0.00	0.01	0.00	0.05
Net income:
Basic (in dollars per share)	0.93	0.70	3.33	2.69
Diluted (in dollars per share)	$ 0.92	$ 0.69	$ 3.30	$ 2.64
Restricted performance shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding shares not included in the computation of diluted earnings per share (in shares)			900,000	1,400,000
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding shares not included in the computation of diluted earnings per share (in shares)	0		0