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Revenues - Revenues disaggregated by Line of Business and Geographical Area (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Revenue $ 1,290 $ 1,142
United States    
Disaggregation of Revenue [Line Items]    
Revenue 714 612
Non-U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 576 530
MIS    
Disaggregation of Revenue [Line Items]    
Revenue 794 670
MIS | United States    
Disaggregation of Revenue [Line Items]    
Revenue 503 411
MIS | Non-U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 291 259
MIS | Corporate Finance (CFG)    
Disaggregation of Revenue [Line Items]    
Revenue 453 355
MIS | Corporate Finance (CFG) | United States    
Disaggregation of Revenue [Line Items]    
Revenue 314 243
MIS | Corporate Finance (CFG) | Non-U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 139 112
MIS | Structured Finance (SFG)    
Disaggregation of Revenue [Line Items]    
Revenue 96 101
MIS | Structured Finance (SFG) | United States    
Disaggregation of Revenue [Line Items]    
Revenue 61 62
MIS | Structured Finance (SFG) | Non-U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 35 39
MIS | Financial Institutions (FIG)    
Disaggregation of Revenue [Line Items]    
Revenue 125 116
MIS | Financial Institutions (FIG) | United States    
Disaggregation of Revenue [Line Items]    
Revenue 60 46
MIS | Financial Institutions (FIG) | Non-U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 65 70
MIS | Public, Project And Infrastructure Finance (PPIF)    
Disaggregation of Revenue [Line Items]    
Revenue 109 93
MIS | Public, Project And Infrastructure Finance (PPIF) | United States    
Disaggregation of Revenue [Line Items]    
Revenue 68 60
MIS | Public, Project And Infrastructure Finance (PPIF) | Non-U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 41 33
MIS | Rating Revenue    
Disaggregation of Revenue [Line Items]    
Revenue 783 665
MIS | Rating Revenue | United States    
Disaggregation of Revenue [Line Items]    
Revenue 503 411
MIS | Rating Revenue | Non-U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 280 254
MIS | MIS Other    
Disaggregation of Revenue [Line Items]    
Revenue 11 5
MIS | MIS Other | United States    
Disaggregation of Revenue [Line Items]    
Revenue 0 0
MIS | MIS Other | Non-U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 11 5
MA    
Disaggregation of Revenue [Line Items]    
Revenue 496 472
MA | United States    
Disaggregation of Revenue [Line Items]    
Revenue 211 201
MA | Non-U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 285 271
MA | Research, Data And Analytics (RD&A)    
Disaggregation of Revenue [Line Items]    
Revenue 358 308
MA | Research, Data And Analytics (RD&A) | United States    
Disaggregation of Revenue [Line Items]    
Revenue 158 135
MA | Research, Data And Analytics (RD&A) | Non-U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 200 173
MA | Enterprise Risk Solutions (ERS)    
Disaggregation of Revenue [Line Items]    
Revenue 138 122
MA | Enterprise Risk Solutions (ERS) | United States    
Disaggregation of Revenue [Line Items]    
Revenue 53 48
MA | Enterprise Risk Solutions (ERS) | Non-U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 85 74
MA | Professional Services    
Disaggregation of Revenue [Line Items]    
Revenue 0 42
MA | Professional Services | United States    
Disaggregation of Revenue [Line Items]    
Revenue 0 18
MA | Professional Services | Non-U.S.    
Disaggregation of Revenue [Line Items]    
Revenue $ 0 $ 24