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Revenues - Revenues Disaggregated by Line of Business and Geographical Area (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 7,088	$ 5,916	$ 5,468
Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	7,088	5,916	5,468
U.S.
Disaggregation of Revenue [Line Items]
Revenue	3,836	3,071	2,865
Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	3,252	2,845	2,603
MA
Disaggregation of Revenue [Line Items]
Revenue	3,295	3,056	2,769
MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	3,308	3,069	2,777
MA | U.S.
Disaggregation of Revenue [Line Items]
Revenue	1,390	1,321	1,231
MA | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,390	1,321	1,231
MA | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	1,905	1,735	1,538
MA | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,905	1,735	1,538
MA | Total Decision Solutions | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,516	1,383	1,245
MA | Total Decision Solutions | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	570	550	511
MA | Total Decision Solutions | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	946	833	734
MA | Research and Insights | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	926	884	812
MA | Research and Insights | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	514	490	470
MA | Research and Insights | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	412	394	342
MA | Data and Information | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	853	789	712
MA | Data and Information | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	306	281	250
MA | Data and Information | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	547	508	462
MIS
Disaggregation of Revenue [Line Items]
Revenue	3,793	2,860	2,699
MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	3,986	3,046	2,873
MIS | U.S.
Disaggregation of Revenue [Line Items]
Revenue	2,446	1,750	1,634
MIS | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	2,446	1,750	1,634
MIS | Non-U.S.
Disaggregation of Revenue [Line Items]
Revenue	1,347	1,110	1,065
MIS | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,347	1,110	1,065
MIS | Rating Revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	3,759	2,830	2,653
MIS | Rating Revenue | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	2,446	1,749	1,629
MIS | Rating Revenue | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,313	1,081	1,024
MIS | Corporate finance (CFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,950	1,404	1,269
MIS | Corporate finance (CFG) | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1,333	952	832
MIS | Corporate finance (CFG) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	617	452	437
MIS | Structured finance (SFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	518	405	462
MIS | Structured finance (SFG) | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	368	252	308
MIS | Structured finance (SFG) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	150	153	154
MIS | Financial institutions (FIG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	727	545	491
MIS | Financial institutions (FIG) | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	386	253	223
MIS | Financial institutions (FIG) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	341	292	268
MIS | Public, project and infrastructure finance (PPIF) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	564	476	431
MIS | Public, project and infrastructure finance (PPIF) | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	359	292	266
MIS | Public, project and infrastructure finance (PPIF) | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	205	184	165
MIS | MIS Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	34	30	46
MIS | MIS Other | U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	0	1	5
MIS | MIS Other | Non-U.S. | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 34	$ 29	$ 41

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