Restructuring - Schedule of Initial Restructuring Charge Recorded and the Ending Reserve Balance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
2021 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	$ 19
Ending Reserve Balance	19
2021 Restructuring Plan | Operating segments | Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	3
Ending Reserve Balance	3
2021 Restructuring Plan | Operating segments | Market Intelligence
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	3
Ending Reserve Balance	3
2021 Restructuring Plan | Operating segments | Platts
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	0
Ending Reserve Balance	0
2021 Restructuring Plan | Operating segments | Indices
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	0
Ending Reserve Balance	0
2021 Restructuring Plan | Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	13
Ending Reserve Balance	13
2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	65	$ 65
Ending Reserve Balance	13
2020 Restructuring Plan | Operating segments | Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	4
Ending Reserve Balance	1
2020 Restructuring Plan | Operating segments | Market Intelligence
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	27
Ending Reserve Balance	4
2020 Restructuring Plan | Operating segments | Platts
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	10
Ending Reserve Balance	4
2020 Restructuring Plan | Operating segments | Indices
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	5
Ending Reserve Balance	0
2020 Restructuring Plan | Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	19
Ending Reserve Balance	$ 4