Restructuring (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Restructuring Plan, 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	$ 86
Ending Reserve Balance	78
Restructuring Plan, 2013 [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	49	49
Ending Reserve Balance		7
S&P Ratings [Member] | Restructuring Plan, 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	45
Ending Reserve Balance	42
S&P Ratings [Member] | Restructuring Plan, 2013 [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded		13
Ending Reserve Balance		2
S&P Capital IQ [Member] | Restructuring Plan, 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	9
Ending Reserve Balance	7
S&P Capital IQ [Member] | Restructuring Plan, 2013 [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded		10
Ending Reserve Balance		1
C&C [Member] | Restructuring Plan, 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	16
Ending Reserve Balance	14
C&C [Member] | Restructuring Plan, 2013 [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded		10
Ending Reserve Balance		2
Corporate [Member] | Restructuring Plan, 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	16
Ending Reserve Balance	15
Corporate [Member] | Restructuring Plan, 2013 [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded		16
Ending Reserve Balance		2
McGraw Hill Construction [Member] | Restructuring Plan, 2014 [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	3
Ending Reserve Balance	1
McGraw Hill Construction [Member] | Restructuring Plan, 2013 [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded		1
Ending Reserve Balance		$ 1