Restructuring - Schedule of Initial Restructuring Charge Recorded and the Ending Reserve Balance (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	$ 82
Ending Reserve Balance	59
2025 Restructuring Plan | Operating Segments | Market Intelligence
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	33
Ending Reserve Balance	24
2025 Restructuring Plan | Operating Segments | Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	10
Ending Reserve Balance	5
2025 Restructuring Plan | Operating Segments | Commodity Insights
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	11
Ending Reserve Balance	8
2025 Restructuring Plan | Operating Segments | Mobility
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	5
Ending Reserve Balance	5
2025 Restructuring Plan | Operating Segments | Indices
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	0
Ending Reserve Balance	0
2025 Restructuring Plan | Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	23
Ending Reserve Balance	17
2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	125
Ending Reserve Balance	38	$ 88
2024 Restructuring Plan | Operating Segments | Market Intelligence
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	77
Ending Reserve Balance	18
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	4
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	$ 14