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Revenues - Transaction and Relationship Revenue (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
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 7,088 | $ 5,916 | $ 5,468
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
Percentage of Revenues | 100.00% | 100.00% | 100.00%
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
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Banking | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 551 | $ 521 | $ 481
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Insurance | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 598 | $ 550 | $ 504
Percentage of Revenues | 100.00% | 100.00% | 100.00%
KYC | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 367 | $ 312 | $ 260
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Corporate finance (CFG) | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 1,950 | $ 1,404 | $ 1,269
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Structured finance (SFG) | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 518 | $ 405 | $ 462
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Financial institutions (FIG) | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 727 | $ 545 | $ 491
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Public, project and infrastructure finance (PPIF) | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 564 | $ 476 | $ 431
Percentage of Revenues | 100.00% | 100.00% | 100.00%
MIS Other | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 34 | $ 30 | $ 46
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Total Decision Solutions | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 1,516 | $ 1,383 | $ 1,245
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Research and Insights | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 926 | $ 884 | $ 812
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Data and Information | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 853 | $ 789 | $ 712
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Transaction Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 2,678 | $ 1,826 | $ 1,682
Percentage of Revenues | 38.00% | 31.00% | 31.00%
Transaction Revenue | MA |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 161 | $ 188 | $ 170
Transaction Revenue | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of Revenues | 5.00% | 6.00% | 6.00%
Transaction Revenue | MIS |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 2,517 | $ 1,638 | $ 1,512
Transaction Revenue | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of Revenues | 66.00% | 57.00% | 56.00%
Transaction Revenue | Banking | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 117 | $ 130 | $ 124
Percentage of Revenues | 21.00% | 25.00% | 26.00%
Transaction Revenue | Insurance | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 23 | $ 38 | $ 28
Percentage of Revenues | 4.00% | 7.00% | 6.00%
Transaction Revenue | KYC | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 2 | $ 1 | $ 1
Percentage of Revenues | 1.00% | 0.00% | 0.00%
Transaction Revenue | Corporate finance (CFG) | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 1,415 | $ 887 | $ 772
Percentage of Revenues | 73.00% | 63.00% | 61.00%
Transaction Revenue | Structured finance (SFG) | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 292 | $ 190 | $ 262
Percentage of Revenues | 56.00% | 47.00% | 57.00%
Transaction Revenue | Financial institutions (FIG) | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 418 | $ 254 | $ 211
Percentage of Revenues | 57.00% | 47.00% | 43.00%
Transaction Revenue | Public, project and infrastructure finance (PPIF) | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 384 | $ 301 | $ 263
Percentage of Revenues | 68.00% | 63.00% | 61.00%
Transaction Revenue | MIS Other | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 8 | $ 6 | $ 4
Percentage of Revenues | 24.00% | 20.00% | 9.00%
Transaction Revenue | Total Decision Solutions | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 142 | $ 169 | $ 153
Percentage of Revenues | 9.00% | 12.00% | 12.00%
Transaction Revenue | Research and Insights | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 15 | $ 16 | $ 17
Percentage of Revenues | 2.00% | 2.00% | 2.00%
Transaction Revenue | Data and Information | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 4 | $ 3 | $ 0
Percentage of Revenues | 0.00% | 0.00% | 0.00%
Relationship Revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 4,410 | $ 4,090 | $ 3,786
Percentage of Revenues | 62.00% | 69.00% | 69.00%
Relationship Revenue | MA |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 3,134 | $ 2,868 | $ 2,599
Relationship Revenue | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of Revenues | 95.00% | 94.00% | 94.00%
Relationship Revenue | MIS |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 1,276 | $ 1,222 | $ 1,187
Relationship Revenue | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Percentage of Revenues | 34.00% | 43.00% | 44.00%
Relationship Revenue | Banking | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 434 | $ 391 | $ 357
Percentage of Revenues | 79.00% | 75.00% | 74.00%
Relationship Revenue | Insurance | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 575 | $ 512 | $ 476
Percentage of Revenues | 96.00% | 93.00% | 94.00%
Relationship Revenue | KYC | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 365 | $ 311 | $ 259
Percentage of Revenues | 99.00% | 100.00% | 100.00%
Relationship Revenue | Corporate finance (CFG) | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 535 | $ 517 | $ 497
Percentage of Revenues | 27.00% | 37.00% | 39.00%
Relationship Revenue | Structured finance (SFG) | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 226 | $ 215 | $ 200
Percentage of Revenues | 44.00% | 53.00% | 43.00%
Relationship Revenue | Financial institutions (FIG) | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 309 | $ 291 | $ 280
Percentage of Revenues | 43.00% | 53.00% | 57.00%
Relationship Revenue | Public, project and infrastructure finance (PPIF) | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 180 | $ 175 | $ 168
Percentage of Revenues | 32.00% | 37.00% | 39.00%
Relationship Revenue | MIS Other | MIS | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 26 | $ 24 | $ 42
Percentage of Revenues | 76.00% | 80.00% | 91.00%
Relationship Revenue | Total Decision Solutions | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 1,374 | $ 1,214 | $ 1,092
Percentage of Revenues | 91.00% | 88.00% | 88.00%
Relationship Revenue | Research and Insights | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 911 | $ 868 | $ 795
Percentage of Revenues | 98.00% | 98.00% | 98.00%
Relationship Revenue | Data and Information | MA | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 849 | $ 786 | $ 712
Percentage of Revenues | 100.00% | 100.00% | 100.00%

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