Restructuring (Details) (2013 restructuring plan, USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013 Positions
Restructuring Cost and Reserve [Line Items]
Workforce reduction (in positions)		520
Restructuring charges paid	$ 7
S&P Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	13
Ending Reserve Balance	12
S&P Capital IQ
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	10
Ending Reserve Balance	7
C&C
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	10
Ending Reserve Balance	5
Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	16
Ending Reserve Balance	8
Total
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	49
Ending Reserve Balance	$ 32	$ 39