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Revenues - Consolidated Revenue Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenue	$ 1,813	$ 1,472	$ 5,416	$ 4,436
MA
Segment Reporting Information [Line Items]
Revenue	831	776	2,432	2,260
MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	834	779	2,442	2,270
MIS
Segment Reporting Information [Line Items]
Revenue	982	696	2,984	2,176
MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	1,030	743	3,128	2,314
United States
Segment Reporting Information [Line Items]
Revenue	999	762	2,942	2,300
United States | MA
Segment Reporting Information [Line Items]
Revenue	346	334	1,021	971
United States | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	346	334	1,021	971
United States | MIS
Segment Reporting Information [Line Items]
Revenue	653	428	1,921	1,329
United States | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	653	428	1,921	1,329
Non-U.S.
Segment Reporting Information [Line Items]
Revenue	814	710	2,474	2,136
Non-U.S. | MA
Segment Reporting Information [Line Items]
Revenue	485	442	1,411	1,289
Non-U.S. | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	485	442	1,411	1,289
Non-U.S. | MIS
Segment Reporting Information [Line Items]
Revenue	329	268	1,063	847
Non-U.S. | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	329	268	1,063	847
EMEA
Segment Reporting Information [Line Items]
Revenue	546	465	1,654	1,404
EMEA | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	334	310	969	895
EMEA | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	212	155	685	509
Asia-Pacific
Segment Reporting Information [Line Items]
Revenue	157	143	476	437
Asia-Pacific | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	84	76	251	224
Asia-Pacific | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	73	67	225	213
Americas
Segment Reporting Information [Line Items]
Revenue	111	102	344	295
Americas | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	67	56	191	170
Americas | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 44	$ 46	$ 153	$ 125

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