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Revenues - Revenues Disaggregated by Line of Business and Geographical Area (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 7,088 | $ 5,916 | $ 5,468
Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 7,088 | 5,916 | 5,468
U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 3,836 | 3,071 | 2,865
Non-U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 3,252 | 2,845 | 2,603
MA |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 3,295 | 3,056 | 2,769
MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 3,308 | 3,069 | 2,777
MA | U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,390 | 1,321 | 1,231
MA | U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,390 | 1,321 | 1,231
MA | Non-U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,905 | 1,735 | 1,538
MA | Non-U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,905 | 1,735 | 1,538
MA | Total Decision Solutions | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,516 | 1,383 | 1,245
MA | Total Decision Solutions | U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 570 | 550 | 511
MA | Total Decision Solutions | Non-U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 946 | 833 | 734
MA | Research and Insights | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 926 | 884 | 812
MA | Research and Insights | U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 514 | 490 | 470
MA | Research and Insights | Non-U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 412 | 394 | 342
MA | Data and Information | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 853 | 789 | 712
MA | Data and Information | U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 306 | 281 | 250
MA | Data and Information | Non-U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 547 | 508 | 462
MIS |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 3,793 | 2,860 | 2,699
MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 3,986 | 3,046 | 2,873
MIS | U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 2,446 | 1,750 | 1,634
MIS | U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 2,446 | 1,750 | 1,634
MIS | Non-U.S. |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,347 | 1,110 | 1,065
MIS | Non-U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,347 | 1,110 | 1,065
MIS | Rating Revenue | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 3,759 | 2,830 | 2,653
MIS | Rating Revenue | U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 2,446 | 1,749 | 1,629
MIS | Rating Revenue | Non-U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,313 | 1,081 | 1,024
MIS | Corporate finance (CFG) | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,950 | 1,404 | 1,269
MIS | Corporate finance (CFG) | U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,333 | 952 | 832
MIS | Corporate finance (CFG) | Non-U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 617 | 452 | 437
MIS | Structured finance (SFG) | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 518 | 405 | 462
MIS | Structured finance (SFG) | U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 368 | 252 | 308
MIS | Structured finance (SFG) | Non-U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 150 | 153 | 154
MIS | Financial institutions (FIG) | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 727 | 545 | 491
MIS | Financial institutions (FIG) | U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 386 | 253 | 223
MIS | Financial institutions (FIG) | Non-U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 341 | 292 | 268
MIS | Public, project and infrastructure finance (PPIF) | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 564 | 476 | 431
MIS | Public, project and infrastructure finance (PPIF) | U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 359 | 292 | 266
MIS | Public, project and infrastructure finance (PPIF) | Non-U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 205 | 184 | 165
MIS | MIS Other | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 34 | 30 | 46
MIS | MIS Other | U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0 | 1 | 5
MIS | MIS Other | Non-U.S. | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 34 | $ 29 | $ 41

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