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Revenues - Revenue by Category (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
Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(53)	(51)	(158)	(154)
Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(53)	(51)	(158)	(154)
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 | Eliminations
Disaggregation of Revenue [Line Items]
Revenue	3	3	9	10
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) | DS Banking Product and Service | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	140	140	419	405
MA | Decision Solutions (DS) | Insurance | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	171	148	502	439
MA | Decision Solutions (DS) | KYC | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	113	95	321	270
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 | 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
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 | Eliminations
Disaggregation of Revenue [Line Items]
Revenue	50	48	149	144
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) | Investment-grade | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	124	149	431	416
MIS | Corporate Finance (CFG) | High-yield | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	114	80	266	232
MIS | Corporate Finance (CFG) | Bank loans | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	155	120	413	422
MIS | Corporate Finance (CFG) | Other accounts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	183	166	542	499
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) | Other accounts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	2	1	3	2
MIS | Structured Finance (SFG) | Asset-backed securities | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	35	34	105	101
MIS | Structured Finance (SFG) | RMBS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	29	24	84	73
MIS | Structured Finance (SFG) | CMBS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	25	27	78	66
MIS | Structured Finance (SFG) | Structured credit | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	55	49	149	138
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) | Insurance | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	52	46	151	166
MIS | Financial Institutions (FIG) | Other accounts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	3	3	10	10
MIS | Financial Institutions (FIG) | Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	136	108	386	344
MIS | Financial Institutions (FIG) | Managed investments | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	17	13	43	40
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) | Public finance / sovereign | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	68	61	215	187
MIS | Public, Project and Infrastructure Finance (PPIF) | Project and infrastructure | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	93	93	271	262
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 | 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

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