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Revenues - Revenues Disaggregated by Line of Business and Geographical Area (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
United States
Disaggregation of Revenue [Line Items]
Revenue	992	974	2,057	1,943
Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	906	843	1,765	1,660
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 | United States
Disaggregation of Revenue [Line Items]
Revenue	381	338	756	675
MA | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	381	338	756	675
MA | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	507	464	991	926
MA | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	507	464	991	926
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) | United States
Disaggregation of Revenue [Line Items]
Revenue	162	138
MA | Decision Solutions (DS) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			329	276
MA | Decision Solutions (DS) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	251	228
MA | Decision Solutions (DS) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			489	455
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 | Research and Insights (R&I) | United States
Disaggregation of Revenue [Line Items]
Revenue	139	124
MA | Research and Insights (R&I) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			267	246
MA | Research and Insights (R&I) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	110	102
MA | Research and Insights (R&I) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			218	202
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
MA | Data and Information (D&I) | United States
Disaggregation of Revenue [Line Items]
Revenue	80	76
MA | Data and Information (D&I) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			160	153
MA | Data and Information (D&I) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	146	134
MA | Data and Information (D&I) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			284	269
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 | United States
Disaggregation of Revenue [Line Items]
Revenue	611	636	1,301	1,268
MIS | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	611	636	1,301	1,268
MIS | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	399	379	774	734
MIS | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	399	379	774	734
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) | United States
Disaggregation of Revenue [Line Items]
Revenue	314	342
MIS | Corporate Finance (CFG) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			705	714
MIS | Corporate Finance (CFG) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	198	183
MIS | Corporate Finance (CFG) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			371	340
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) | United States
Disaggregation of Revenue [Line Items]
Revenue	91	92
MIS | Structured Finance (SFG) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			191	168
MIS | Structured Finance (SFG) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	44	39
MIS | Structured Finance (SFG) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			82	77
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) | United States
Disaggregation of Revenue [Line Items]
Revenue	99	104
MIS | Financial Institutions (FIG) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			194	202
MIS | Financial Institutions (FIG) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	92	91
MIS | Financial Institutions (FIG) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			188	188
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) | United States
Disaggregation of Revenue [Line Items]
Revenue	107	98
MIS | Public, Project and Infrastructure Finance (PPIF) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			211	184
MIS | Public, Project and Infrastructure Finance (PPIF) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	55	56
MIS | Public, Project and Infrastructure Finance (PPIF) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			114	111
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 | Total ratings revenue | United States
Disaggregation of Revenue [Line Items]
Revenue	611	636
MIS | Total ratings revenue | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			1,301	1,268
MIS | Total ratings revenue | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	389	369
MIS | Total ratings revenue | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			755	716
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
MIS | MIS Other | United States
Disaggregation of Revenue [Line Items]
Revenue	0	0
MIS | MIS Other | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			0	0
MIS | MIS Other | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	$ 10	$ 10
MIS | MIS Other | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			$ 19	$ 18

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