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Revenues - Revenues Disaggregated by Line of Business and Geographical Area (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 1,813	$ 1,472	$ 5,416	$ 4,436
United States
Disaggregation of Revenue [Line Items]
Revenue	999	762	2,942	2,300
Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	814	710	2,474	2,136
MA
Disaggregation of Revenue [Line Items]
Revenue	831	776	2,432	2,260
MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	834	779	2,442	2,270
MA | United States
Disaggregation of Revenue [Line Items]
Revenue	346	334	1,021	971
MA | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	346	334	1,021	971
MA | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	485	442	1,411	1,289
MA | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	485	442	1,411	1,289
MA | Decision Solutions (DS)
Disaggregation of Revenue [Line Items]
Revenue	383	354
MA | Decision Solutions (DS) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	383	354	1,114	1,022
MA | Decision Solutions (DS) | United States
Disaggregation of Revenue [Line Items]
Revenue	144	141
MA | Decision Solutions (DS) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			420	406
MA | Decision Solutions (DS) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	239	213
MA | Decision Solutions (DS) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			694	616
MA | Research and Insights (R&I)
Disaggregation of Revenue [Line Items]
Revenue	235	222
MA | Research and Insights (R&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	235	222	683	654
MA | Research and Insights (R&I) | United States
Disaggregation of Revenue [Line Items]
Revenue	128	124
MA | Research and Insights (R&I) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			374	361
MA | Research and Insights (R&I) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	107	98
MA | Research and Insights (R&I) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			309	293
MA | Data and Information (D&I)
Disaggregation of Revenue [Line Items]
Revenue	213	200
MA | Data and Information (D&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	213	200	635	584
MA | Data and Information (D&I) | United States
Disaggregation of Revenue [Line Items]
Revenue	74	69
MA | Data and Information (D&I) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			227	204
MA | Data and Information (D&I) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	139	131
MA | Data and Information (D&I) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			408	380
MIS
Disaggregation of Revenue [Line Items]
Revenue	982	696	2,984	2,176
MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,030	743	3,128	2,314
MIS | United States
Disaggregation of Revenue [Line Items]
Revenue	653	428	1,921	1,329
MIS | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	653	428	1,921	1,329
MIS | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	329	268	1,063	847
MIS | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	329	268	1,063	847
MIS | Corporate Finance (CFG)
Disaggregation of Revenue [Line Items]
Revenue	515	346
MIS | Corporate Finance (CFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	515	346	1,569	1,067
MIS | Corporate Finance (CFG) | United States
Disaggregation of Revenue [Line Items]
Revenue	364	242
MIS | Corporate Finance (CFG) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			1,078	727
MIS | Corporate Finance (CFG) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	151	104
MIS | Corporate Finance (CFG) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			491	340
MIS | Structured Finance (SFG)
Disaggregation of Revenue [Line Items]
Revenue	135	102
MIS | Structured Finance (SFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	135	102	380	303
MIS | Structured Finance (SFG) | United States
Disaggregation of Revenue [Line Items]
Revenue	98	65
MIS | Structured Finance (SFG) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			266	186
MIS | Structured Finance (SFG) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	37	37
MIS | Structured Finance (SFG) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			114	117
MIS | Financial Institutions (FIG)
Disaggregation of Revenue [Line Items]
Revenue	170	126
MIS | Financial Institutions (FIG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	170	126	560	413
MIS | Financial Institutions (FIG) | United States
Disaggregation of Revenue [Line Items]
Revenue	90	52
MIS | Financial Institutions (FIG) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			292	188
MIS | Financial Institutions (FIG) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	80	74
MIS | Financial Institutions (FIG) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			268	225
MIS | Public, Project and Infrastructure Finance (PPIF)
Disaggregation of Revenue [Line Items]
Revenue	154	115
MIS | Public, Project and Infrastructure Finance (PPIF) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	154	115	449	371
MIS | Public, Project and Infrastructure Finance (PPIF) | United States
Disaggregation of Revenue [Line Items]
Revenue	100	69
MIS | Public, Project and Infrastructure Finance (PPIF) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			284	228
MIS | Public, Project and Infrastructure Finance (PPIF) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	54	46
MIS | Public, Project and Infrastructure Finance (PPIF) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			165	143
MIS | Total ratings revenue
Disaggregation of Revenue [Line Items]
Revenue	974	689
MIS | Total ratings revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	974	689	2,958	2,154
MIS | Total ratings revenue | United States
Disaggregation of Revenue [Line Items]
Revenue	652	428
MIS | Total ratings revenue | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			1,920	1,329
MIS | Total ratings revenue | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	322	261
MIS | Total ratings revenue | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			1,038	825
MIS | MIS Other
Disaggregation of Revenue [Line Items]
Revenue	8	7
MIS | MIS Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	8	7	26	22
MIS | MIS Other | United States
Disaggregation of Revenue [Line Items]
Revenue	1	0
MIS | MIS Other | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			1	0
MIS | MIS Other | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	$ 7	$ 7
MIS | MIS Other | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			$ 25	$ 22

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