Restructuring - Schedule of Initial Restructuring Charge Recorded and the Ending Reserve Balance (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	$ 105
Ending Reserve Balance	57
2025 Restructuring Plan | Operating Segments | Market Intelligence
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	44
Ending Reserve Balance	23
2025 Restructuring Plan | Operating Segments | Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	10
Ending Reserve Balance	3
2025 Restructuring Plan | Operating Segments | Commodity Insights
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	11
Ending Reserve Balance	5
2025 Restructuring Plan | Operating Segments | Mobility
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	11
Ending Reserve Balance	10
2025 Restructuring Plan | Operating Segments | Indices
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	1
Ending Reserve Balance	1
2025 Restructuring Plan | Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	28
Ending Reserve Balance	15
2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	125
Ending Reserve Balance	27	$ 88
2024 Restructuring Plan | Operating Segments | Market Intelligence
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	77
Ending Reserve Balance	12
2024 Restructuring Plan | Operating Segments | Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	4
Ending Reserve Balance	1
2024 Restructuring Plan | Operating Segments | Commodity Insights
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	13
Ending Reserve Balance	2
2024 Restructuring Plan | Operating Segments | Mobility
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	6
Ending Reserve Balance	1
2024 Restructuring Plan | Operating Segments | Indices
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	1
Ending Reserve Balance	0
2024 Restructuring Plan | Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	24
Ending Reserve Balance	$ 11