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Revenues - Consolidated Revenue Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 1,898	$ 1,817	$ 3,822	$ 3,603
MA
Segment Reporting Information [Line Items]
Revenue	888	802	1,747	1,601
MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	891	806	1,753	1,608
MIS
Segment Reporting Information [Line Items]
Revenue	1,010	1,015	2,075	2,002
MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	1,060	1,064	2,174	2,098
United States
Segment Reporting Information [Line Items]
Revenue	992	974	2,057	1,943
United States | MA
Segment Reporting Information [Line Items]
Revenue	381	338	756	675
United States | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	381	338	756	675
United States | MIS
Segment Reporting Information [Line Items]
Revenue	611	636	1,301	1,268
United States | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	611	636	1,301	1,268
Non-U.S.
Segment Reporting Information [Line Items]
Revenue	906	843	1,765	1,660
Non-U.S. | MA
Segment Reporting Information [Line Items]
Revenue	507	464	991	926
Non-U.S. | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	507	464	991	926
Non-U.S. | MIS
Segment Reporting Information [Line Items]
Revenue	399	379	774	734
Non-U.S. | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	399	379	774	734
EMEA
Segment Reporting Information [Line Items]
Revenue	613	566	1,182	1,108
EMEA | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	347	319	678	635
EMEA | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	266	247	504	473
Asia-Pacific
Segment Reporting Information [Line Items]
Revenue	174	164	341	319
Asia-Pacific | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	92	82	180	167
Asia-Pacific | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	82	82	161	152
Americas
Segment Reporting Information [Line Items]
Revenue	119	113	242	233
Americas | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	68	63	133	124
Americas | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 51	$ 50	$ 109	$ 109

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