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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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 2,007	$ 1,813	$ 5,829	$ 5,416
United States
Disaggregation of Revenue [Line Items]
Revenue	1,118	999	3,175	2,942
Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	889	814	2,654	2,474
MA
Disaggregation of Revenue [Line Items]
Revenue	909	831	2,656	2,432
MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	912	834	2,665	2,442
MA | United States
Disaggregation of Revenue [Line Items]
Revenue	386	346	1,142	1,021
MA | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	386	346	1,142	1,021
MA | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	523	485	1,514	1,411
MA | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	523	485	1,514	1,411
MA | Decision Solutions (DS)
Disaggregation of Revenue [Line Items]
Revenue	424	383
MA | Decision Solutions (DS) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	424	383	1,242	1,114
MA | Decision Solutions (DS) | United States
Disaggregation of Revenue [Line Items]
Revenue	167	144
MA | Decision Solutions (DS) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			496	420
MA | Decision Solutions (DS) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	257	239
MA | Decision Solutions (DS) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			746	694
MA | Research and Insights (R&I)
Disaggregation of Revenue [Line Items]
Revenue	252	235
MA | Research and Insights (R&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	252	235	737	683
MA | Research and Insights (R&I) | United States
Disaggregation of Revenue [Line Items]
Revenue	137	128
MA | Research and Insights (R&I) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			404	374
MA | Research and Insights (R&I) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	115	107
MA | Research and Insights (R&I) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			333	309
MA | Data and Information (D&I)
Disaggregation of Revenue [Line Items]
Revenue	233	213
MA | Data and Information (D&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	233	213	677	635
MA | Data and Information (D&I) | United States
Disaggregation of Revenue [Line Items]
Revenue	82	74
MA | Data and Information (D&I) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			242	227
MA | Data and Information (D&I) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	151	139
MA | Data and Information (D&I) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			435	408
MIS
Disaggregation of Revenue [Line Items]
Revenue	1,098	982	3,173	2,984
MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,148	1,030	3,322	3,128
MIS | United States
Disaggregation of Revenue [Line Items]
Revenue	732	653	2,033	1,921
MIS | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	732	653	2,033	1,921
MIS | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	366	329	1,140	1,063
MIS | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	366	329	1,140	1,063
MIS | Corporate Finance (CFG)
Disaggregation of Revenue [Line Items]
Revenue	576	515
MIS | Corporate Finance (CFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	576	515	1,652	1,569
MIS | Corporate Finance (CFG) | United States
Disaggregation of Revenue [Line Items]
Revenue	405	364
MIS | Corporate Finance (CFG) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			1,110	1,078
MIS | Corporate Finance (CFG) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	171	151
MIS | Corporate Finance (CFG) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			542	491
MIS | Structured Finance (SFG)
Disaggregation of Revenue [Line Items]
Revenue	146	135
MIS | Structured Finance (SFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	146	135	419	380
MIS | Structured Finance (SFG) | United States
Disaggregation of Revenue [Line Items]
Revenue	108	98
MIS | Structured Finance (SFG) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			299	266
MIS | Structured Finance (SFG) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	38	37
MIS | Structured Finance (SFG) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			120	114
MIS | Financial Institutions (FIG)
Disaggregation of Revenue [Line Items]
Revenue	208	170
MIS | Financial Institutions (FIG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	208	170	590	560
MIS | Financial Institutions (FIG) | United States
Disaggregation of Revenue [Line Items]
Revenue	111	90
MIS | Financial Institutions (FIG) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			305	292
MIS | Financial Institutions (FIG) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	97	80
MIS | Financial Institutions (FIG) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			285	268
MIS | Public, Project and Infrastructure Finance (PPIF)
Disaggregation of Revenue [Line Items]
Revenue	161	154
MIS | Public, Project and Infrastructure Finance (PPIF) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	161	154	486	449
MIS | Public, Project and Infrastructure Finance (PPIF) | United States
Disaggregation of Revenue [Line Items]
Revenue	108	100
MIS | Public, Project and Infrastructure Finance (PPIF) | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			319	284
MIS | Public, Project and Infrastructure Finance (PPIF) | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	53	54
MIS | Public, Project and Infrastructure Finance (PPIF) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			167	165
MIS | Total ratings revenue
Disaggregation of Revenue [Line Items]
Revenue	1,091	974
MIS | Total ratings revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,091	974	3,147	2,958
MIS | Total ratings revenue | United States
Disaggregation of Revenue [Line Items]
Revenue	732	652
MIS | Total ratings revenue | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			2,033	1,920
MIS | Total ratings revenue | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	359	322
MIS | Total ratings revenue | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			1,114	1,038
MIS | MIS Other
Disaggregation of Revenue [Line Items]
Revenue	7	8
MIS | MIS Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	7	8	26	26
MIS | MIS Other | United States
Disaggregation of Revenue [Line Items]
Revenue	0	1
MIS | MIS Other | United States | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue			0	1
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			$ 26	$ 25

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