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Revenues - Transaction and Relationship Revenue (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
Percentage of Revenues	100.00%	100.00%	100.00%
Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 7,088	$ 5,916	$ 5,468
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
Percentage of Revenues	100.00%	100.00%	100.00%
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
Percentage of Revenues	100.00%	100.00%	100.00%
Banking | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 551	$ 521	$ 481
Percentage of Revenues	100.00%	100.00%	100.00%
Insurance | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 598	$ 550	$ 504
Percentage of Revenues	100.00%	100.00%	100.00%
KYC | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 367	$ 312	$ 260
Percentage of Revenues	100.00%	100.00%	100.00%
Corporate finance (CFG) | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 1,950	$ 1,404	$ 1,269
Percentage of Revenues	100.00%	100.00%	100.00%
Structured finance (SFG) | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 518	$ 405	$ 462
Percentage of Revenues	100.00%	100.00%	100.00%
Financial institutions (FIG) | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 727	$ 545	$ 491
Percentage of Revenues	100.00%	100.00%	100.00%
Public, project and infrastructure finance (PPIF) | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 564	$ 476	$ 431
Percentage of Revenues	100.00%	100.00%	100.00%
MIS Other | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 34	$ 30	$ 46
Percentage of Revenues	100.00%	100.00%	100.00%
Total Decision Solutions | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 1,516	$ 1,383	$ 1,245
Percentage of Revenues	100.00%	100.00%	100.00%
Research and Insights | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 926	$ 884	$ 812
Percentage of Revenues	100.00%	100.00%	100.00%
Data and Information | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 853	$ 789	$ 712
Percentage of Revenues	100.00%	100.00%	100.00%
Transaction Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 2,678	$ 1,826	$ 1,682
Percentage of Revenues	38.00%	31.00%	31.00%
Transaction Revenue | MA
Disaggregation of Revenue [Line Items]
Revenue	$ 161	$ 188	$ 170
Transaction Revenue | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Percentage of Revenues	5.00%	6.00%	6.00%
Transaction Revenue | MIS
Disaggregation of Revenue [Line Items]
Revenue	$ 2,517	$ 1,638	$ 1,512
Transaction Revenue | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Percentage of Revenues	66.00%	57.00%	56.00%
Transaction Revenue | Banking | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 117	$ 130	$ 124
Percentage of Revenues	21.00%	25.00%	26.00%
Transaction Revenue | Insurance | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 23	$ 38	$ 28
Percentage of Revenues	4.00%	7.00%	6.00%
Transaction Revenue | KYC | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 2	$ 1	$ 1
Percentage of Revenues	1.00%	0.00%	0.00%
Transaction Revenue | Corporate finance (CFG) | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 1,415	$ 887	$ 772
Percentage of Revenues	73.00%	63.00%	61.00%
Transaction Revenue | Structured finance (SFG) | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 292	$ 190	$ 262
Percentage of Revenues	56.00%	47.00%	57.00%
Transaction Revenue | Financial institutions (FIG) | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 418	$ 254	$ 211
Percentage of Revenues	57.00%	47.00%	43.00%
Transaction Revenue | Public, project and infrastructure finance (PPIF) | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 384	$ 301	$ 263
Percentage of Revenues	68.00%	63.00%	61.00%
Transaction Revenue | MIS Other | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 8	$ 6	$ 4
Percentage of Revenues	24.00%	20.00%	9.00%
Transaction Revenue | Total Decision Solutions | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 142	$ 169	$ 153
Percentage of Revenues	9.00%	12.00%	12.00%
Transaction Revenue | Research and Insights | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 15	$ 16	$ 17
Percentage of Revenues	2.00%	2.00%	2.00%
Transaction Revenue | Data and Information | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 4	$ 3	$ 0
Percentage of Revenues	0.00%	0.00%	0.00%
Relationship Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 4,410	$ 4,090	$ 3,786
Percentage of Revenues	62.00%	69.00%	69.00%
Relationship Revenue | MA
Disaggregation of Revenue [Line Items]
Revenue	$ 3,134	$ 2,868	$ 2,599
Relationship Revenue | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Percentage of Revenues	95.00%	94.00%	94.00%
Relationship Revenue | MIS
Disaggregation of Revenue [Line Items]
Revenue	$ 1,276	$ 1,222	$ 1,187
Relationship Revenue | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Percentage of Revenues	34.00%	43.00%	44.00%
Relationship Revenue | Banking | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 434	$ 391	$ 357
Percentage of Revenues	79.00%	75.00%	74.00%
Relationship Revenue | Insurance | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 575	$ 512	$ 476
Percentage of Revenues	96.00%	93.00%	94.00%
Relationship Revenue | KYC | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 365	$ 311	$ 259
Percentage of Revenues	99.00%	100.00%	100.00%
Relationship Revenue | Corporate finance (CFG) | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 535	$ 517	$ 497
Percentage of Revenues	27.00%	37.00%	39.00%
Relationship Revenue | Structured finance (SFG) | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 226	$ 215	$ 200
Percentage of Revenues	44.00%	53.00%	43.00%
Relationship Revenue | Financial institutions (FIG) | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 309	$ 291	$ 280
Percentage of Revenues	43.00%	53.00%	57.00%
Relationship Revenue | Public, project and infrastructure finance (PPIF) | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 180	$ 175	$ 168
Percentage of Revenues	32.00%	37.00%	39.00%
Relationship Revenue | MIS Other | MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 26	$ 24	$ 42
Percentage of Revenues	76.00%	80.00%	91.00%
Relationship Revenue | Total Decision Solutions | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 1,374	$ 1,214	$ 1,092
Percentage of Revenues	91.00%	88.00%	88.00%
Relationship Revenue | Research and Insights | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 911	$ 868	$ 795
Percentage of Revenues	98.00%	98.00%	98.00%
Relationship Revenue | Data and Information | MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 849	$ 786	$ 712
Percentage of Revenues	100.00%	100.00%	100.00%

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