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Revenues - Revenue by Category (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 1,898	$ 1,817	$ 3,822	$ 3,603
Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(53)	(53)	(105)	(103)
Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(53)	(53)	(105)	(103)
MA
Disaggregation of Revenue [Line Items]
Revenue	888	802	1,747	1,601
MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	891	806	1,753	1,608
MA | Eliminations
Disaggregation of Revenue [Line Items]
Revenue	3	4	6	7
MA | Decision Solutions (DS)
Disaggregation of Revenue [Line Items]
Revenue	413	366
MA | Decision Solutions (DS) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	413	366	818	731
MA | Decision Solutions (DS) | DS Banking Product and Service | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	138	131	279	265
MA | Decision Solutions (DS) | Insurance | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	168	147	331	291
MA | Decision Solutions (DS) | KYC | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	107	88	208	175
MA | Research and Insights (R&I)
Disaggregation of Revenue [Line Items]
Revenue	249	226
MA | Research and Insights (R&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	249	226	485	448
MA | Data and Information (D&I)
Disaggregation of Revenue [Line Items]
Revenue	226	210
MA | Data and Information (D&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	226	210	444	422
MIS
Disaggregation of Revenue [Line Items]
Revenue	1,010	1,015	2,075	2,002
MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,060	1,064	2,174	2,098
MIS | Eliminations
Disaggregation of Revenue [Line Items]
Revenue	50	49	99	96
MIS | Corporate Finance (CFG)
Disaggregation of Revenue [Line Items]
Revenue	512	525
MIS | Corporate Finance (CFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	512	525	1,076	1,054
MIS | Corporate Finance (CFG) | Investment-grade | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	142	120	307	267
MIS | Corporate Finance (CFG) | High-yield | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	85	85	152	152
MIS | Corporate Finance (CFG) | Bank loans | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	98	147	258	302
MIS | Corporate Finance (CFG) | Other accounts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	187	173	359	333
MIS | Structured Finance (SFG)
Disaggregation of Revenue [Line Items]
Revenue	135	131
MIS | Structured Finance (SFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	135	131	273	245
MIS | Structured Finance (SFG) | Other accounts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	0	0	1	1
MIS | Structured Finance (SFG) | Asset-backed securities | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	35	34	70	67
MIS | Structured Finance (SFG) | RMBS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	29	25	55	49
MIS | Structured Finance (SFG) | CMBS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	25	22	53	39
MIS | Structured Finance (SFG) | Structured credit | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	46	50	94	89
MIS | Financial Institutions (FIG)
Disaggregation of Revenue [Line Items]
Revenue	191	195
MIS | Financial Institutions (FIG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	191	195	382	390
MIS | Financial Institutions (FIG) | Insurance | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	54	61	99	120
MIS | Financial Institutions (FIG) | Other accounts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	4	4	7	7
MIS | Financial Institutions (FIG) | Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	120	115	250	236
MIS | Financial Institutions (FIG) | Managed investments | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	13	15	26	27
MIS | Public, Project and Infrastructure Finance (PPIF)
Disaggregation of Revenue [Line Items]
Revenue	162	154
MIS | Public, Project and Infrastructure Finance (PPIF) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	162	154	325	295
MIS | Public, Project and Infrastructure Finance (PPIF) | Public finance / sovereign | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	75	67	147	126
MIS | Public, Project and Infrastructure Finance (PPIF) | Project and infrastructure | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	87	87	178	169
MIS | Total ratings revenue
Disaggregation of Revenue [Line Items]
Revenue	1,000	1,005
MIS | Total ratings revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,000	1,005	2,056	1,984
MIS | MIS Other
Disaggregation of Revenue [Line Items]
Revenue	10	10
MIS | MIS Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 10	$ 10	$ 19	$ 18

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