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Revenues - Transaction and Relationship Revenue (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue	$ 1,813	$ 1,472	$ 5,416	$ 4,436
Percentage of revenues	100.00%	100.00%	100.00%	100.00%
Transaction Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 701	$ 437	$ 2,151	$ 1,403
Percentage of revenues	39.00%	30.00%	40.00%	32.00%
Recurring Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 1,112	$ 1,035	$ 3,265	$ 3,033
Percentage of revenues	61.00%	70.00%	60.00%	68.00%
MA
Disaggregation of Revenue [Line Items]
Revenue	$ 831	$ 776	$ 2,432	$ 2,260
MA | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 834	$ 779	$ 2,442	$ 2,270
Percentage of revenues	100.00%	100.00%	100.00%	100.00%
MA | Decision Solutions (DS)
Disaggregation of Revenue [Line Items]
Revenue	$ 383	$ 354
MA | Decision Solutions (DS) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 383	$ 354	$ 1,114	$ 1,022
Percentage of revenues	100.00%	100.00%	100.00%	100.00%
MA | Research and Insights (R&I)
Disaggregation of Revenue [Line Items]
Revenue	$ 235	$ 222
MA | Research and Insights (R&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 235	$ 222	$ 683	$ 654
Percentage of revenues	100.00%	100.00%	100.00%	100.00%
MA | Data and Information (D&I)
Disaggregation of Revenue [Line Items]
Revenue	$ 213	$ 200
MA | Data and Information (D&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 213	$ 200	$ 635	$ 584
Percentage of revenues	100.00%	100.00%	100.00%	100.00%
MA | Transaction Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 38	$ 48	$ 119	$ 140
MA | Transaction Revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Percentage of revenues	5.00%	6.00%	5.00%	6.00%
MA | Transaction Revenue | Decision Solutions (DS) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 33	$ 43	$ 105	$ 126
Percentage of revenues	9.00%	12.00%	9.00%	12.00%
MA | Transaction Revenue | Research and Insights (R&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 4	$ 4	$ 11	$ 12
Percentage of revenues	2.00%	2.00%	2.00%	2.00%
MA | Transaction Revenue | Data and Information (D&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 1	$ 1	$ 3	$ 2
Percentage of revenues	0.00%	1.00%	0.00%	0.00%
MA | Recurring Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 793	$ 728	$ 2,313	$ 2,120
MA | Recurring Revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Percentage of revenues	95.00%	94.00%	95.00%	94.00%
MA | Recurring Revenue | Decision Solutions (DS) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 350	$ 311	$ 1,009	$ 896
Percentage of revenues	91.00%	88.00%	91.00%	88.00%
MA | Recurring Revenue | Research and Insights (R&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 231	$ 218	$ 672	$ 642
Percentage of revenues	98.00%	98.00%	98.00%	98.00%
MA | Recurring Revenue | Data and Information (D&I) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 212	$ 199	$ 632	$ 582
Percentage of revenues	100.00%	99.00%	100.00%	100.00%
MIS
Disaggregation of Revenue [Line Items]
Revenue	$ 982	$ 696	$ 2,984	$ 2,176
MIS | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 1,030	$ 743	$ 3,128	$ 2,314
Percentage of revenues	100.00%	100.00%	100.00%	100.00%
MIS | Corporate Finance (CFG)
Disaggregation of Revenue [Line Items]
Revenue	$ 515	$ 346
MIS | Corporate Finance (CFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 515	$ 346	$ 1,569	$ 1,067
Percentage of revenues	100.00%	100.00%	100.00%	100.00%
MIS | Structured Finance (SFG)
Disaggregation of Revenue [Line Items]
Revenue	$ 135	$ 102
MIS | Structured Finance (SFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 135	$ 102	$ 380	$ 303
Percentage of revenues	100.00%	100.00%	100.00%	100.00%
MIS | Financial Institutions (FIG)
Disaggregation of Revenue [Line Items]
Revenue	$ 170	$ 126
MIS | Financial Institutions (FIG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 170	$ 126	$ 560	$ 413
Percentage of revenues	100.00%	100.00%	100.00%	100.00%
MIS | Public, Project and Infrastructure Finance (PPIF)
Disaggregation of Revenue [Line Items]
Revenue	$ 154	$ 115
MIS | Public, Project and Infrastructure Finance (PPIF) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 154	$ 115	$ 449	$ 371
Percentage of revenues	100.00%	100.00%	100.00%	100.00%
MIS | MIS Other
Disaggregation of Revenue [Line Items]
Revenue	$ 8	$ 7
MIS | MIS Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 8	$ 7	$ 26	$ 22
Percentage of revenues	100.00%	100.00%	100.00%	100.00%
MIS | Transaction Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 663	$ 389	$ 2,032	$ 1,263
MIS | Transaction Revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Percentage of revenues	68.00%	56.00%	68.00%	58.00%
MIS | Transaction Revenue | Corporate Finance (CFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 382	$ 216	$ 1,169	$ 682
Percentage of revenues	74.00%	62.00%	75.00%	64.00%
MIS | Transaction Revenue | Structured Finance (SFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 78	$ 49	$ 213	$ 142
Percentage of revenues	58.00%	48.00%	56.00%	47.00%
MIS | Transaction Revenue | Financial Institutions (FIG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 92	$ 52	$ 329	$ 195
Percentage of revenues	54.00%	41.00%	59.00%	47.00%
MIS | Transaction Revenue | Public, Project and Infrastructure Finance (PPIF) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 109	$ 70	$ 315	$ 240
Percentage of revenues	71.00%	61.00%	70.00%	65.00%
MIS | Transaction Revenue | MIS Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 2	$ 2	$ 6	$ 4
Percentage of revenues	25.00%	29.00%	23.00%	18.00%
MIS | Recurring Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 319	$ 307	$ 952	$ 913
MIS | Recurring Revenue | Operating Segments
Disaggregation of Revenue [Line Items]
Percentage of revenues	32.00%	44.00%	32.00%	42.00%
MIS | Recurring Revenue | Corporate Finance (CFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 133	$ 130	$ 400	$ 385
Percentage of revenues	26.00%	38.00%	25.00%	36.00%
MIS | Recurring Revenue | Structured Finance (SFG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 57	$ 53	$ 167	$ 161
Percentage of revenues	42.00%	52.00%	44.00%	53.00%
MIS | Recurring Revenue | Financial Institutions (FIG) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 78	$ 74	$ 231	$ 218
Percentage of revenues	46.00%	59.00%	41.00%	53.00%
MIS | Recurring Revenue | Public, Project and Infrastructure Finance (PPIF) | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 45	$ 45	$ 134	$ 131
Percentage of revenues	29.00%	39.00%	30.00%	35.00%
MIS | Recurring Revenue | MIS Other | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 6	$ 5	$ 20	$ 18
Percentage of revenues	75.00%	71.00%	77.00%	82.00%

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