Restructuring - Schedule of Initial Restructuring Charge Recorded and the Ending Reserve Balance (Details) - 2025 Restructuring Plan - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	$ 157
Ending Reserve Balance	49	$ 85
Operating Segments \| Market Intelligence
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	56
Ending Reserve Balance	12
Operating Segments \| Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	17
Ending Reserve Balance	3
Operating Segments \| Energy
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	19
Ending Reserve Balance	8
Operating Segments \| Mobility
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	15
Ending Reserve Balance	7
Operating Segments \| Indices
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	4
Ending Reserve Balance	3
Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	46
Ending Reserve Balance	$ 16