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Summary of Significant Accounting Policies (Policies) | 6 Months Ended
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Jun. 30, 2025
Accounting Policies [Abstract] |
Goodwill | Goodwill Moody’s evaluates its goodwill for impairment at the reporting unit level, defined as an operating segment (i.e., MA and MIS), or one level below an operating segment (i.e., a component of an operating segment). Prior to 2025, MA's reporting unit structure consisted of two reporting units comprised of businesses that offer: i) data and data-driven analytical solutions; and ii) risk-management software, workflow and CRE solutions. During the first quarter of 2025, MA reorganized its management and reporting structure, which affected the composition of the reporting units within the MA reportable segment. As a result, MA's reporting unit structure now consists of one reporting unit, which is consistent with the segment's current management structure and operating model. This reorganization did not result in a change to the Company's reportable segments. The Company performed assessments of the reporting units impacted by the reorganization immediately before and after the reorganization became effective and determined that it was not more likely than not that the fair value of any reporting unit was less than its carrying amount. Subsequent to the aforementioned reorganization of the MA reporting unit structure, the Company now has three reporting units: two within the Company’s ratings business (one for the ICRA business and one that encompasses all of Moody’s other ratings operations) and one reporting unit within MA.

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- Definition Disclosure of accounting policy for goodwill. This accounting policy also may address how an entity assesses and measures impairment of goodwill, how reporting units are determined, how goodwill is allocated to such units, and how the fair values of the reporting units are determined. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482548/350-20-55-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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