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Pension and Other Retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Moody's shares held in ESOP |  | 304,076 | 315,400 |
U.S. Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Employee contribution percentage of employee contribution in participation |  | 50.00% |  |
Maximum employee contribution in profit participation plan |  | 3.00% |  |
Defined contribution compensation expense |  | $ 73 | $ 71 | $ 35
U.S. Plans | Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Expected rate of return |  | 6.10% | 6.55% | 5.05%
Employer contributions |  | $ 11 | $ 11 |
U.S. Plans | Other Retirement Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Expected rate of return |  | 0.00% | 0.00% | 0.00%
Employer contributions |  | $ 1 | $ 1 |
U.S. Plans | Equity Securities | Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Plan asset, target asset allocation percentage |  | 35.00% |  |
U.S. Plans | Equity Securities | Pension Plans | Minimum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Plan asset, target asset allocation percentage |  | 23.00% |  |
U.S. Plans | Equity Securities | Pension Plans | Maximum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Plan asset, target asset allocation percentage |  | 46.00% |  |
U.S. Plans | Fixed Income Securities | Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Plan asset, target asset allocation percentage |  | 61.00% |  |
U.S. Plans | Fixed Income Securities | Pension Plans | Minimum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Plan asset, target asset allocation percentage |  | 44.00% |  |
U.S. Plans | Fixed Income Securities | Pension Plans | Maximum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Plan asset, target asset allocation percentage |  | 77.00% |  |
U.S. Plans | Other Investments | Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Plan asset, target asset allocation percentage |  | 5.00% |  |
U.S. Plans | Other Investments | Pension Plans | Minimum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Plan asset, target asset allocation percentage |  | 2.00% |  |
U.S. Plans | Other Investments | Pension Plans | Maximum |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Plan asset, target asset allocation percentage |  | 8.00% |  |
Non-U.S. Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Defined contribution compensation expense |  | $ 50 | $ 42 | $ 37
Forecast | U.S. Plans | Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Abstract] |  |  |  |
Expected rate of return | 6.60% |  |  |

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480489/718-40-50-1 + Details
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