Restructuring - Schedule of Initial Restructuring Charge Recorded and the Ending Reserve Balance (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Dec. 31, 2025
2026 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	$ 42
Ending Reserve Balance	37
2026 Restructuring Plan | Operating Segments | Market Intelligence
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	15
Ending Reserve Balance	14
2026 Restructuring Plan | Operating Segments | Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	8
Ending Reserve Balance	7
2026 Restructuring Plan | Operating Segments | Energy
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	8
Ending Reserve Balance	7
2026 Restructuring Plan | Operating Segments | Mobility
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	0
Ending Reserve Balance	0
2026 Restructuring Plan | Operating Segments | Indices
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	0
Ending Reserve Balance	0
2026 Restructuring Plan | Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	11
Ending Reserve Balance	9
2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	157
Ending Reserve Balance	33	$ 85
2025 Restructuring Plan | Operating Segments | Market Intelligence
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	56
Ending Reserve Balance	8
2025 Restructuring Plan | Operating Segments | Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	17
Ending Reserve Balance	3
2025 Restructuring Plan | Operating Segments | Energy
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	19
Ending Reserve Balance	7
2025 Restructuring Plan | Operating Segments | Mobility
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	15
Ending Reserve Balance	2
2025 Restructuring Plan | Operating Segments | Indices
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	4
Ending Reserve Balance	2
2025 Restructuring Plan | Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	46
Ending Reserve Balance	$ 11