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Revenues - Revenue by Category (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 1,924	$ 1,786
Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(52)	(50)
Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(52)	(50)
MA
Disaggregation of Revenue [Line Items]
Revenue	859	799
MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	862	802
MA | Eliminations
Disaggregation of Revenue [Line Items]
Revenue	3	3
MA | Decision Solutions (DS)
Disaggregation of Revenue [Line Items]
Revenue	405	365
MA | Decision Solutions (DS) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	405	365
MA | Decision Solutions (DS) | DS Banking Product and Service | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	141	134
MA | Decision Solutions (DS) | Insurance | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	163	144
MA | Decision Solutions (DS) | KYC | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	101	87
MA | Research and Insights (R&I)
Disaggregation of Revenue [Line Items]
Revenue	236	222
MA | Research and Insights (R&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	236	222
MA | Data and Information (D&I)
Disaggregation of Revenue [Line Items]
Revenue	218	212
MA | Data and Information (D&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	218	212
MIS
Disaggregation of Revenue [Line Items]
Revenue	1,065	987
MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,114	1,034
MIS | Eliminations
Disaggregation of Revenue [Line Items]
Revenue	49	47
MIS | Corporate Finance (CFG)
Disaggregation of Revenue [Line Items]
Revenue	564	529
MIS | Corporate Finance (CFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	564	529
MIS | Corporate Finance (CFG) | Investment-grade | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	165	147
MIS | Corporate Finance (CFG) | High-yield | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	67	67
MIS | Corporate Finance (CFG) | Bank loans | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	160	155
MIS | Corporate Finance (CFG) | Other accounts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	172	160
MIS | Structured Finance (SFG)
Disaggregation of Revenue [Line Items]
Revenue	138	114
MIS | Structured Finance (SFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	138	114
MIS | Structured Finance (SFG) | Other accounts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1	1
MIS | Structured Finance (SFG) | Asset-backed securities | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	35	33
MIS | Structured Finance (SFG) | RMBS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	26	24
MIS | Structured Finance (SFG) | CMBS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	28	17
MIS | Structured Finance (SFG) | Structured credit | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	48	39
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
MIS | Financial Institutions (FIG) | Insurance | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	45	59
MIS | Financial Institutions (FIG) | Other accounts | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	3	3
MIS | Financial Institutions (FIG) | Banking | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	130	121
MIS | Financial Institutions (FIG) | Managed investments | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	13	12
MIS | Public, Project and Infrastructure Finance (PPIF)
Disaggregation of Revenue [Line Items]
Revenue	163	141
MIS | Public, Project and Infrastructure Finance (PPIF) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	163	141
MIS | Public, Project and Infrastructure Finance (PPIF) | Public finance / sovereign | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	72	59
MIS | Public, Project and Infrastructure Finance (PPIF) | Project and infrastructure | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	91	82
MIS | Total ratings revenue
Disaggregation of Revenue [Line Items]
Revenue	1,056	979
MIS | Total ratings revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,056	979
MIS | MIS Other
Disaggregation of Revenue [Line Items]
Revenue	9	8
MIS | MIS Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 9	$ 8

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