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Revenues - Revenue by Category (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,817 | $ 1,494 | $ 3,603 | $ 2,964
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (53) | (50) | (103) | (98)
Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (53) | (50) | (103) | (98)
MA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 802 | 747 | 1,601 | 1,484
MA | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 806 | 751 | 1,608 | 1,491
MA | Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4 | 4 | 7 | 7
MA | Decision Solutions (DS) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 366 | 334 |  |
MA | Decision Solutions (DS) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 366 | 334 | 731 | 668
MA | Decision Solutions (DS) | DS Banking Product and Service | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 131 | 123 | 265 | 254
MA | Decision Solutions (DS) | Insurance | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 147 | 133 | 291 | 266
MA | Decision Solutions (DS) | KYC | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 88 | 78 | 175 | 148
MA | Research and Insights (R&I) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 226 | 217 |  |
MA | Research and Insights (R&I) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 226 | 217 | 448 | 432
MA | Data and Information (D&I) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 210 | 196 |  |
MA | Data and Information (D&I) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 210 | 196 | 422 | 384
MIS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,015 | 747 | 2,002 | 1,480
MIS | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,064 | 793 | 2,098 | 1,571
MIS | Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 49 | 46 | 96 | 91
MIS | Corporate Finance (CFG) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 525 | 365 |  |
MIS | Corporate Finance (CFG) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 525 | 365 | 1,054 | 721
MIS | Corporate Finance (CFG) | Investment-grade | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 120 | 94 | 267 | 209
MIS | Corporate Finance (CFG) | High-yield | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 85 | 46 | 152 | 78
MIS | Corporate Finance (CFG) | Bank loans | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 147 | 68 | 302 | 127
MIS | Corporate Finance (CFG) | Other accounts | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 173 | 157 | 333 | 307
MIS | Structured Finance (SFG) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 131 | 102 |  |
MIS | Structured Finance (SFG) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 131 | 102 | 245 | 201
MIS | Structured Finance (SFG) | Other accounts | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 1 | 1
MIS | Structured Finance (SFG) | Asset-backed securities | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 34 | 32 | 67 | 59
MIS | Structured Finance (SFG) | RMBS | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 25 | 25 | 49 | 50
MIS | Structured Finance (SFG) | CMBS | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 22 | 14 | 39 | 28
MIS | Structured Finance (SFG) | Structured credit | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 50 | 31 | 89 | 63
MIS | Financial Institutions (FIG) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 195 | 145 |  |
MIS | Financial Institutions (FIG) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 195 | 145 | 390 | 287
MIS | Financial Institutions (FIG) | Insurance | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 61 | 35 | 120 | 68
MIS | Financial Institutions (FIG) | Other accounts | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4 | 3 | 7 | 6
MIS | Financial Institutions (FIG) | Banking | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 115 | 97 | 236 | 197
MIS | Financial Institutions (FIG) | Managed investments | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 15 | 10 | 27 | 16
MIS | Public, Project and Infrastructure Finance (PPIF) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 154 | 127 |  |
MIS | Public, Project and Infrastructure Finance (PPIF) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 154 | 127 | 295 | 256
MIS | Public, Project and Infrastructure Finance (PPIF) | Public finance / sovereign | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 67 | 54 | 126 | 106
MIS | Public, Project and Infrastructure Finance (PPIF) | Project and infrastructure | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 87 | 73 | 169 | 150
MIS | Total ratings revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,005 | 739 |  |
MIS | Total ratings revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,005 | 739 | 1,984 | 1,465
MIS | MIS Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10 | 8 |  |
MIS | MIS Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 10 | $ 8 | $ 18 | $ 15

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