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Revenues - Revenue by Category (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
Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(206)	(199)	(182)
Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	7,088	5,916	5,468
Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(206)	(199)	(182)
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
MA | Eliminations
Disaggregation of Revenue [Line Items]
Revenue	13	13	8
MA | Total Decision Solutions | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,516	1,383	1,245
MA | Total Decision Solutions | Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	551	521	481
MA | Total Decision Solutions | Insurance | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	598	550	504
MA | Total Decision Solutions | KYC | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	367	312	260
MA | Research and Insights | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	926	884	812
MA | Data and Information | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	853	789	712
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
MIS | Eliminations
Disaggregation of Revenue [Line Items]
Revenue	193	186	174
MIS | Corporate finance (CFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,950	1,404	1,269
MIS | Corporate finance (CFG) | Investment-grade | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	488	335	294
MIS | Corporate finance (CFG) | High-yield | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	285	150	108
MIS | Corporate finance (CFG) | Bank loans | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	527	292	275
MIS | Corporate finance (CFG) | Other accounts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	650	627	592
MIS | Structured finance (SFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	518	405	462
MIS | Structured finance (SFG) | Asset-backed securities | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	130	121	116
MIS | Structured finance (SFG) | RMBS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	98	92	106
MIS | Structured finance (SFG) | CMBS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	94	60	98
MIS | Structured finance (SFG) | Structured credit | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	193	129	140
MIS | Structured finance (SFG) | Other accounts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	3	3	2
MIS | Financial institutions (FIG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	727	545	491
MIS | Financial institutions (FIG) | Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	450	378	337
MIS | Financial institutions (FIG) | Insurance | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	214	123	113
MIS | Financial institutions (FIG) | Managed investments | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	49	32	28
MIS | Financial institutions (FIG) | Other accounts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	14	12	13
MIS | Public, project and infrastructure finance (PPIF) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	564	476	431
MIS | Public, project and infrastructure finance (PPIF) | Public finance / sovereign | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	240	205	197
MIS | Public, project and infrastructure finance (PPIF) | Project and infrastructure | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	324	271	234
MIS | Rating Revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	3,759	2,830	2,653
MIS | MIS Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 34	$ 30	$ 46

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