Restructuring (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015 USD ($) position	Dec. 31, 2014 USD ($) position
2015 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Workforce reduction (in positions) | position	260
Initial Charge Recorded	$ 30
Restructuring charges paid	2
2015 Restructuring Plan | S&P Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	11
Ending Reserve Balance	11
2015 Restructuring Plan | S&P Capital IQ
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	13
Ending Reserve Balance	12
2015 Restructuring Plan | C&C
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	3
Ending Reserve Balance	2
2015 Restructuring Plan | Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	3
Ending Reserve Balance	3
2015 Restructuring Plan | Total
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	30
Ending Reserve Balance	28
2014 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Workforce reduction (in positions) | position		590
Restructuring charges paid	37
2014 Restructuring Plan | S&P Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	45
Ending Reserve Balance	21
2014 Restructuring Plan | S&P Capital IQ
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	9
Ending Reserve Balance	3
2014 Restructuring Plan | C&C
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	16
Ending Reserve Balance	6
2014 Restructuring Plan | C&C | McGraw Hill Construction [Member]
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	3
Ending Reserve Balance	1
2014 Restructuring Plan | Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	16
Ending Reserve Balance	11
2014 Restructuring Plan | Total
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	86
Ending Reserve Balance	$ 41	$ 78