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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2018
Income Tax Disclosure [Abstract]          
Revision of estimated repatriation tax liability resulting from tax reform legislation         $ 236
Revision of estimated repatriation tax liability resulting from tax reform legislation, due at end of year $ 12        
Excess tax benefits from stock compensation (27)        
Unrecognized tax benefits, reduction resulting from lapse of applicable statute of limitations and settlement 11        
Unrecognized tax benefits, decrease resulting from current period tax positions 2        
Valuation allowance 25 $ 24 $ 21 $ 18  
Unrecognized tax benefits 211 196 322 $ 388  
Interest accrued on UTPs $ 47 $ 36 $ 47    
Inflation reduction act impact on ETR In August 2022, the U.S. Congress passed the Inflation Reduction Act, which included a corporate minimum tax on book earnings of 15%, an excise tax on corporate share repurchases of 1%, and certain climate change and energy tax credit incentives. The adoption of a corporate minimum tax of 15% did not have a significant impact on Moody’s ETR. The excise tax of 1% on corporate share buybacks is recorded to shareholders' equity and does not have an impact on the Company’s ETR.