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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	25.00%	23.10%	23.60%	23.20%
Excess tax benefits from stock compensation			$ 27
Unrecognized tax benefits, period increase (decrease), net of federal tax	$ 8		14
Unrecognized tax benefits, period increase (decrease)			$ 15
Income tax examination, description			Moody’s is subject to U.S. federal income tax as well as income tax in various state, local and foreign jurisdictions. The Company's U.S. federal income tax returns for 2021 through 2023 remain open to examination. The Company’s New York City tax returns for 2018 through 2022 are currently under examination, and 2023 is open to examination. The Company's U.K. corporate income tax returns are currently under audit for years 2017 through 2021, while years 2022 through 2023 remain open to examination.

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Unrecognized Tax Benefits, Period Increase (Decrease), Net of Federal Tax

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

+ References

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A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings.

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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