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Revenues - Consolidated Revenue Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Revenue	$ 1,924	$ 1,786
MA
Segment Reporting Information [Line Items]
Revenue	859	799
MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	862	802
MIS
Segment Reporting Information [Line Items]
Revenue	1,065	987
MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	1,114	1,034
United States
Segment Reporting Information [Line Items]
Revenue	1,065	969
United States | MA
Segment Reporting Information [Line Items]
Revenue	375	337
United States | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	375	337
United States | MIS
Segment Reporting Information [Line Items]
Revenue	690	632
United States | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	690	632
Non-U.S.
Segment Reporting Information [Line Items]
Revenue	859	817
Non-U.S. | MA
Segment Reporting Information [Line Items]
Revenue	484	462
Non-U.S. | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	484	462
Non-U.S. | MIS
Segment Reporting Information [Line Items]
Revenue	375	355
Non-U.S. | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	375	355
EMEA
Segment Reporting Information [Line Items]
Revenue	569	542
EMEA | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	331	316
EMEA | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	238	226
Asia-Pacific
Segment Reporting Information [Line Items]
Revenue	167	155
Asia-Pacific | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	88	85
Asia-Pacific | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	79	70
Americas
Segment Reporting Information [Line Items]
Revenue	123	120
Americas | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	65	61
Americas | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 58	$ 59

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