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Revenues - Consolidated Revenue Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Revenue	$ 2,007	$ 1,813	$ 5,829	$ 5,416
MA
Segment Reporting Information [Line Items]
Revenue	909	831	2,656	2,432
MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	912	834	2,665	2,442
MIS
Segment Reporting Information [Line Items]
Revenue	1,098	982	3,173	2,984
MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	1,148	1,030	3,322	3,128
United States
Segment Reporting Information [Line Items]
Revenue	1,118	999	3,175	2,942
United States | MA
Segment Reporting Information [Line Items]
Revenue	386	346	1,142	1,021
United States | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	386	346	1,142	1,021
United States | MIS
Segment Reporting Information [Line Items]
Revenue	732	653	2,033	1,921
United States | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	732	653	2,033	1,921
Non-U.S.
Segment Reporting Information [Line Items]
Revenue	889	814	2,654	2,474
Non-U.S. | MA
Segment Reporting Information [Line Items]
Revenue	523	485	1,514	1,411
Non-U.S. | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	523	485	1,514	1,411
Non-U.S. | MIS
Segment Reporting Information [Line Items]
Revenue	366	329	1,140	1,063
Non-U.S. | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	366	329	1,140	1,063
EMEA
Segment Reporting Information [Line Items]
Revenue	594	546	1,776	1,654
EMEA | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	358	334	1,036	969
EMEA | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	236	212	740	685
Asia-Pacific
Segment Reporting Information [Line Items]
Revenue	180	157	521	476
Asia-Pacific | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	96	84	276	251
Asia-Pacific | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	84	73	245	225
Americas
Segment Reporting Information [Line Items]
Revenue	115	111	357	344
Americas | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	69	67	202	191
Americas | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 46	$ 44	$ 155	$ 153

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