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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 2,007 | $ 1,813 | $ 5,829 | $ 5,416
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,118 | 999 | 3,175 | 2,942
Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 889 | 814 | 2,654 | 2,474
MA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 909 | 831 | 2,656 | 2,432
MA | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 912 | 834 | 2,665 | 2,442
MA | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 386 | 346 | 1,142 | 1,021
MA | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 386 | 346 | 1,142 | 1,021
MA | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 523 | 485 | 1,514 | 1,411
MA | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 523 | 485 | 1,514 | 1,411
MA | Decision Solutions (DS) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 424 | 383 |  |
MA | Decision Solutions (DS) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 424 | 383 | 1,242 | 1,114
MA | Decision Solutions (DS) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 167 | 144 |  |
MA | Decision Solutions (DS) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 496 | 420
MA | Decision Solutions (DS) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 257 | 239 |  |
MA | Decision Solutions (DS) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 746 | 694
MA | Research and Insights (R&I) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 252 | 235 |  |
MA | Research and Insights (R&I) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 252 | 235 | 737 | 683
MA | Research and Insights (R&I) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 137 | 128 |  |
MA | Research and Insights (R&I) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 404 | 374
MA | Research and Insights (R&I) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 115 | 107 |  |
MA | Research and Insights (R&I) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 333 | 309
MA | Data and Information (D&I) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 233 | 213 |  |
MA | Data and Information (D&I) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 233 | 213 | 677 | 635
MA | Data and Information (D&I) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 82 | 74 |  |
MA | Data and Information (D&I) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 242 | 227
MA | Data and Information (D&I) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 151 | 139 |  |
MA | Data and Information (D&I) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 435 | 408
MIS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,098 | 982 | 3,173 | 2,984
MIS | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,148 | 1,030 | 3,322 | 3,128
MIS | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 732 | 653 | 2,033 | 1,921
MIS | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 732 | 653 | 2,033 | 1,921
MIS | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 366 | 329 | 1,140 | 1,063
MIS | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 366 | 329 | 1,140 | 1,063
MIS | Corporate Finance (CFG) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 576 | 515 |  |
MIS | Corporate Finance (CFG) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 576 | 515 | 1,652 | 1,569
MIS | Corporate Finance (CFG) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 405 | 364 |  |
MIS | Corporate Finance (CFG) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 1,110 | 1,078
MIS | Corporate Finance (CFG) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 171 | 151 |  |
MIS | Corporate Finance (CFG) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 542 | 491
MIS | Structured Finance (SFG) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 146 | 135 |  |
MIS | Structured Finance (SFG) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 146 | 135 | 419 | 380
MIS | Structured Finance (SFG) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 108 | 98 |  |
MIS | Structured Finance (SFG) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 299 | 266
MIS | Structured Finance (SFG) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 38 | 37 |  |
MIS | Structured Finance (SFG) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 120 | 114
MIS | Financial Institutions (FIG) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 208 | 170 |  |
MIS | Financial Institutions (FIG) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 208 | 170 | 590 | 560
MIS | Financial Institutions (FIG) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 111 | 90 |  |
MIS | Financial Institutions (FIG) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 305 | 292
MIS | Financial Institutions (FIG) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 97 | 80 |  |
MIS | Financial Institutions (FIG) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 285 | 268
MIS | Public, Project and Infrastructure Finance (PPIF) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 161 | 154 |  |
MIS | Public, Project and Infrastructure Finance (PPIF) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 161 | 154 | 486 | 449
MIS | Public, Project and Infrastructure Finance (PPIF) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 108 | 100 |  |
MIS | Public, Project and Infrastructure Finance (PPIF) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 319 | 284
MIS | Public, Project and Infrastructure Finance (PPIF) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 53 | 54 |  |
MIS | Public, Project and Infrastructure Finance (PPIF) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 167 | 165
MIS | Total ratings revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,091 | 974 |  |
MIS | Total ratings revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,091 | 974 | 3,147 | 2,958
MIS | Total ratings revenue | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 732 | 652 |  |
MIS | Total ratings revenue | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 2,033 | 1,920
MIS | Total ratings revenue | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 359 | 322 |  |
MIS | Total ratings revenue | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 1,114 | 1,038
MIS | MIS Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7 | 8 |  |
MIS | MIS Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 7 | 8 | 26 | 26
MIS | MIS Other | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 1 |  |
MIS | MIS Other | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 0 | 1
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 |  |  | $ 26 | $ 25

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