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Revenues - Revenue by Category (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
Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | (206) | (199) | (182)
Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 7,088 | 5,916 | 5,468
Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | (206) | (199) | (182)
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 | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 13 | 13 | 8
MA | Total Decision Solutions | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,516 | 1,383 | 1,245
MA | Total Decision Solutions | Banking | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 551 | 521 | 481
MA | Total Decision Solutions | Insurance | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 598 | 550 | 504
MA | Total Decision Solutions | KYC | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 367 | 312 | 260
MA | Research and Insights | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 926 | 884 | 812
MA | Data and Information | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 853 | 789 | 712
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 | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 193 | 186 | 174
MIS | Corporate finance (CFG) | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,950 | 1,404 | 1,269
MIS | Corporate finance (CFG) | Investment-grade | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 488 | 335 | 294
MIS | Corporate finance (CFG) | High-yield | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 285 | 150 | 108
MIS | Corporate finance (CFG) | Bank loans | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 527 | 292 | 275
MIS | Corporate finance (CFG) | Other accounts | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 650 | 627 | 592
MIS | Structured finance (SFG) | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 518 | 405 | 462
MIS | Structured finance (SFG) | Asset-backed securities | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 130 | 121 | 116
MIS | Structured finance (SFG) | RMBS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 98 | 92 | 106
MIS | Structured finance (SFG) | CMBS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 94 | 60 | 98
MIS | Structured finance (SFG) | Structured credit | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 193 | 129 | 140
MIS | Structured finance (SFG) | Other accounts | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 3 | 3 | 2
MIS | Financial institutions (FIG) | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 727 | 545 | 491
MIS | Financial institutions (FIG) | Banking | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 450 | 378 | 337
MIS | Financial institutions (FIG) | Insurance | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 214 | 123 | 113
MIS | Financial institutions (FIG) | Managed investments | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 49 | 32 | 28
MIS | Financial institutions (FIG) | Other accounts | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 14 | 12 | 13
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) | Public finance / sovereign | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 240 | 205 | 197
MIS | Public, project and infrastructure finance (PPIF) | Project and infrastructure | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 324 | 271 | 234
MIS | Rating Revenue | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 3,759 | 2,830 | 2,653
MIS | MIS Other | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 34 | $ 30 | $ 46

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