Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Amounts attributable to McGraw Hill Financial, Inc. common shareholders:
Income from continuing operations	$ 353	$ 286	$ 656	$ 528
Income from discontinued operations	0	6	0	12
Net income	$ 353	$ 292	$ 656	$ 540
Basic weighted-average number of common shares outstanding (in shares)	273,100,000	271,500,000	273,300,000	271,700,000
Effect of stock options and other dilutive securities (in shares)	2,600,000	4,600,000	2,700,000	5,000,000
Diluted weighted-average number of common shares outstanding (in shares)	275,700,000	276,100,000	276,000,000	276,700,000
Income from continuing operations:
Basic (in dollars per share)	$ 1.29	$ 1.05	$ 2.40	$ 1.94
Diluted (in dollars per share)	1.28	1.04	2.38	1.91
Income from discontinued operations:
Basic (in dollars per share)	0.00	0.02	0.00	0.05
Diluted (in dollars per share)	0.00	0.02	0.00	0.05
Net income:
Basic (in dollars per share)	1.29	1.08	2.40	1.99
Diluted (in dollars per share)	$ 1.28	$ 1.06	$ 2.38	$ 1.95
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)			1,700,000	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