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Description of Business and Basis of Presentation - Additional Information (Detail)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Jan. 01, 2018
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Number of reportable segments | segment                 2        
Operating lease right-of-use assets $ 456               $ 456        
Operating lease, liability 574               574        
Deferred tax assets, net 229       $ 197       229 $ 197      
Deferred tax liabilities, net 357       352       357 352      
Operating income 504 $ 549 $ 483 $ 462 376 $ 467 $ 534 $ 491 1,998 1,868 $ 1,821    
Net income attributable to Moody’s $ 359 $ 380 $ 310 $ 373 $ 251 $ 310 $ 376 $ 373 $ 1,422 1,310 $ 1,001    
Accounting Standards Update 2016-02                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Operating lease right-of-use assets                       $ 518  
Operating lease, liability                       622  
Deferred tax assets, net                       150  
Deferred tax liabilities, net                       125  
Accounting Standards Update 2018-02                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Effect of adoption adjustment reduction to retained earnings                       0  
Accounting Standards Update 2014-09                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Effect of adoption adjustment reduction to retained earnings                         $ 156
Accumulated Other Comprehensive Loss | Accounting Standards Update 2018-02                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Effect of adoption adjustment reduction to retained earnings                       (20)  
Retained Earnings | Accounting Standards Update 2018-02                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Effect of adoption adjustment reduction to retained earnings                       $ 20  
Retained Earnings | Accounting Standards Update 2014-09                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Effect of adoption adjustment reduction to retained earnings                         $ 156
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09                          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                          
Revenues                   13      
Operating income                   24      
Net income attributable to Moody’s                   $ 19