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Revenues - Transaction and Relationship Revenue (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 1,786 | $ 1,470
Percentage of revenues | 100.00% | 100.00%
Transaction Revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 719 | $ 476
Percentage of revenues | 40.00% | 32.00%
Recurring Revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 1,067 | $ 994
Percentage of revenues | 60.00% | 68.00%
MA |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 799 | $ 737
MA | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 802 | $ 740
Percentage of revenues | 100.00% | 100.00%
MA | Decision Solutions (DS) |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 365 | $ 334
MA | Decision Solutions (DS) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 365 | $ 334
Percentage of revenues | 100.00% | 100.00%
MA | Research and Insights (R&I) |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 222 | $ 215
MA | Research and Insights (R&I) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 222 | $ 215
Percentage of revenues | 100.00% | 100.00%
MA | Data and Information (D&I) |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 212 | $ 188
MA | Data and Information (D&I) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 212 | $ 188
Percentage of revenues | 100.00% | 100.00%
MA | Transaction Revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 42 | $ 45
MA | Transaction Revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Percentage of revenues | 5.00% | 6.00%
MA | Transaction Revenue | Decision Solutions (DS) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 37 | $ 40
Percentage of revenues | 10.00% | 12.00%
MA | Transaction Revenue | Research and Insights (R&I) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 4 | $ 5
Percentage of revenues | 2.00% | 2.00%
MA | Transaction Revenue | Data and Information (D&I) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 1 | $ 0
Percentage of revenues | 0.00% | 0.00%
MA | Recurring Revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 757 | $ 692
MA | Recurring Revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Percentage of revenues | 95.00% | 94.00%
MA | Recurring Revenue | Decision Solutions (DS) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 328 | $ 294
Percentage of revenues | 90.00% | 88.00%
MA | Recurring Revenue | Research and Insights (R&I) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 218 | $ 210
Percentage of revenues | 98.00% | 98.00%
MA | Recurring Revenue | Data and Information (D&I) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 211 | $ 188
Percentage of revenues | 100.00% | 100.00%
MIS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 987 | $ 733
MIS | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 1,034 | $ 778
Percentage of revenues | 100.00% | 100.00%
MIS | Corporate Finance (CFG) |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 529 | $ 356
MIS | Corporate Finance (CFG) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 529 | $ 356
Percentage of revenues | 100.00% | 100.00%
MIS | Structured Finance (SFG) |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 114 | $ 99
MIS | Structured Finance (SFG) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 114 | $ 99
Percentage of revenues | 100.00% | 100.00%
MIS | Financial Institutions (FIG) |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 195 | $ 142
MIS | Financial Institutions (FIG) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 195 | $ 142
Percentage of revenues | 100.00% | 100.00%
MIS | Public, Project and Infrastructure Finance (PPIF) |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 141 | $ 129
MIS | Public, Project and Infrastructure Finance (PPIF) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 141 | $ 129
Percentage of revenues | 100.00% | 100.00%
MIS | MIS Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 8 | $ 7
MIS | MIS Other | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 8 | $ 7
Percentage of revenues | 100.00% | 100.00%
MIS | Transaction Revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 677 | $ 431
MIS | Transaction Revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Percentage of revenues | 69.00% | 59.00%
MIS | Transaction Revenue | Corporate Finance (CFG) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 399 | $ 230
Percentage of revenues | 75.00% | 65.00%
MIS | Transaction Revenue | Structured Finance (SFG) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 59 | $ 45
Percentage of revenues | 52.00% | 45.00%
MIS | Transaction Revenue | Financial Institutions (FIG) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 122 | $ 70
Percentage of revenues | 63.00% | 49.00%
MIS | Transaction Revenue | Public, Project and Infrastructure Finance (PPIF) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 96 | $ 86
Percentage of revenues | 68.00% | 67.00%
MIS | Transaction Revenue | MIS Other | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 1 | $ 0
Percentage of revenues | 12.00% | 0.00%
MIS | Recurring Revenue |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 310 | $ 302
MIS | Recurring Revenue | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Percentage of revenues | 31.00% | 41.00%
MIS | Recurring Revenue | Corporate Finance (CFG) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 130 | $ 126
Percentage of revenues | 25.00% | 35.00%
MIS | Recurring Revenue | Structured Finance (SFG) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 55 | $ 54
Percentage of revenues | 48.00% | 55.00%
MIS | Recurring Revenue | Financial Institutions (FIG) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 73 | $ 72
Percentage of revenues | 37.00% | 51.00%
MIS | Recurring Revenue | Public, Project and Infrastructure Finance (PPIF) | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 45 | $ 43
Percentage of revenues | 32.00% | 33.00%
MIS | Recurring Revenue | MIS Other | Operating Segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 7 | $ 7
Percentage of revenues | 88.00% | 100.00%

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