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Revenues - Revenues Disaggregated by Line of Business and Geographical Area (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,813 | $ 1,472 | $ 5,416 | $ 4,436
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 999 | 762 | 2,942 | 2,300
Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 814 | 710 | 2,474 | 2,136
MA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 831 | 776 | 2,432 | 2,260
MA | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 834 | 779 | 2,442 | 2,270
MA | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 346 | 334 | 1,021 | 971
MA | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 346 | 334 | 1,021 | 971
MA | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 485 | 442 | 1,411 | 1,289
MA | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 485 | 442 | 1,411 | 1,289
MA | Decision Solutions (DS) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 383 | 354 |  |
MA | Decision Solutions (DS) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 383 | 354 | 1,114 | 1,022
MA | Decision Solutions (DS) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 144 | 141 |  |
MA | Decision Solutions (DS) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 420 | 406
MA | Decision Solutions (DS) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 239 | 213 |  |
MA | Decision Solutions (DS) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 694 | 616
MA | Research and Insights (R&I) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 235 | 222 |  |
MA | Research and Insights (R&I) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 235 | 222 | 683 | 654
MA | Research and Insights (R&I) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 128 | 124 |  |
MA | Research and Insights (R&I) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 374 | 361
MA | Research and Insights (R&I) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 107 | 98 |  |
MA | Research and Insights (R&I) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 309 | 293
MA | Data and Information (D&I) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 213 | 200 |  |
MA | Data and Information (D&I) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 213 | 200 | 635 | 584
MA | Data and Information (D&I) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 74 | 69 |  |
MA | Data and Information (D&I) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 227 | 204
MA | Data and Information (D&I) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 139 | 131 |  |
MA | Data and Information (D&I) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 408 | 380
MIS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 982 | 696 | 2,984 | 2,176
MIS | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,030 | 743 | 3,128 | 2,314
MIS | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 653 | 428 | 1,921 | 1,329
MIS | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 653 | 428 | 1,921 | 1,329
MIS | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 329 | 268 | 1,063 | 847
MIS | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 329 | 268 | 1,063 | 847
MIS | Corporate Finance (CFG) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 515 | 346 |  |
MIS | Corporate Finance (CFG) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 515 | 346 | 1,569 | 1,067
MIS | Corporate Finance (CFG) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 364 | 242 |  |
MIS | Corporate Finance (CFG) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 1,078 | 727
MIS | Corporate Finance (CFG) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 151 | 104 |  |
MIS | Corporate Finance (CFG) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 491 | 340
MIS | Structured Finance (SFG) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 135 | 102 |  |
MIS | Structured Finance (SFG) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 135 | 102 | 380 | 303
MIS | Structured Finance (SFG) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 98 | 65 |  |
MIS | Structured Finance (SFG) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 266 | 186
MIS | Structured Finance (SFG) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 37 | 37 |  |
MIS | Structured Finance (SFG) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 114 | 117
MIS | Financial Institutions (FIG) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 170 | 126 |  |
MIS | Financial Institutions (FIG) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 170 | 126 | 560 | 413
MIS | Financial Institutions (FIG) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 90 | 52 |  |
MIS | Financial Institutions (FIG) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 292 | 188
MIS | Financial Institutions (FIG) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 80 | 74 |  |
MIS | Financial Institutions (FIG) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 268 | 225
MIS | Public, Project and Infrastructure Finance (PPIF) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 154 | 115 |  |
MIS | Public, Project and Infrastructure Finance (PPIF) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 154 | 115 | 449 | 371
MIS | Public, Project and Infrastructure Finance (PPIF) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 100 | 69 |  |
MIS | Public, Project and Infrastructure Finance (PPIF) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 284 | 228
MIS | Public, Project and Infrastructure Finance (PPIF) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 54 | 46 |  |
MIS | Public, Project and Infrastructure Finance (PPIF) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 165 | 143
MIS | Total ratings revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 974 | 689 |  |
MIS | Total ratings revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 974 | 689 | 2,958 | 2,154
MIS | Total ratings revenue | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 652 | 428 |  |
MIS | Total ratings revenue | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 1,920 | 1,329
MIS | Total ratings revenue | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 322 | 261 |  |
MIS | Total ratings revenue | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 1,038 | 825
MIS | MIS Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8 | 7 |  |
MIS | MIS Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 8 | 7 | 26 | 22
MIS | MIS Other | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1 | 0 |  |
MIS | MIS Other | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 1 | 0
MIS | MIS Other | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 7 | $ 7 |  |
MIS | MIS Other | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | $ 25 | $ 22

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