Restructuring - Schedule of initial restructuring charge recorded and the ending reserve balance (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
2022 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	$ 74
Ending Reserve Balance	71
2022 Restructuring Plan | Operating Segments | Market Intelligence
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	18
Ending Reserve Balance	18
2022 Restructuring Plan | Operating Segments | Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	5
Ending Reserve Balance	3
2022 Restructuring Plan | Operating Segments | Commodity Insights
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	5
Ending Reserve Balance	4
2022 Restructuring Plan | Operating Segments | Indices
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	2
Ending Reserve Balance	2
2022 Restructuring Plan | Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	44
Ending Reserve Balance	44
2021 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	19
Ending Reserve Balance	19	$ 19
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 | Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	3
Ending Reserve Balance	3
2021 Restructuring Plan | Operating Segments | Commodity Insights
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