Restructuring - Restructuring Expenses Included in Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 21	$ 6	$ 81	$ 13
Strategic and Operational Efficiency Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring	21	0	81	0
Cost incurred to date	126		126
Employee Severance And Other Restructuring Charges \| Strategic and Operational Efficiency Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring	21	0	75	0
Cost incurred to date	120		120
Real estate related costs \| Strategic and Operational Efficiency Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring	0	0	4	0
Cost incurred to date	4		4
Internally developed software-related charges \| Strategic and Operational Efficiency Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring	0	$ 0	2	$ 0
Cost incurred to date	$ 2		$ 2

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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MOODYS CORP /DE/ 10-Q