Restructuring - Schedule of Initial Restructuring Charge Recorded and the Ending Reserve Balance (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)
2025 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	$ 157
Ending Reserve Balance	85
2025 Restructuring Plan \| Operating segments \| Market Intelligence
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	56
Ending Reserve Balance	25
2025 Restructuring Plan \| Operating segments \| Ratings
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	17
Ending Reserve Balance	5
2025 Restructuring Plan \| Operating segments \| Energy
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	19
Ending Reserve Balance	12
2025 Restructuring Plan \| Operating segments \| Mobility
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	15
Ending Reserve Balance	11
2025 Restructuring Plan \| Operating segments \| Indices
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	4
Ending Reserve Balance	4
2025 Restructuring Plan \| Corporate
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	46
Ending Reserve Balance	28
2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	125
Ending Reserve Balance	15
2024 Restructuring Plan \| Operating segments \| Market Intelligence
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	77
Ending Reserve Balance	7
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 \| Energy
Restructuring Cost and Reserve [Line Items]
Initial Charge Recorded	13
Ending Reserve Balance	0
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	$ 6