Revenues - Consolidated Revenue Information by Geographic Area (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Revenue	$ 1,786	$ 1,470
MA
Segment Reporting Information [Line Items]
Revenue	799	737
MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	802	740
MIS
Segment Reporting Information [Line Items]
Revenue	987	733
MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	1,034	778
United States
Segment Reporting Information [Line Items]
Revenue	969	763
United States | MA
Segment Reporting Information [Line Items]
Revenue	337	317
United States | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	337	317
United States | MIS
Segment Reporting Information [Line Items]
Revenue	632	446
United States | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	632	446
Non-U.S.
Segment Reporting Information [Line Items]
Revenue	817	707
Non-U.S. | MA
Segment Reporting Information [Line Items]
Revenue	462	420
Non-U.S. | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	462	420
Non-U.S. | MIS
Segment Reporting Information [Line Items]
Revenue	355	287
Non-U.S. | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	355	287
EMEA
Segment Reporting Information [Line Items]
Revenue	542	460
EMEA | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	316	287
EMEA | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	226	173
Asia-Pacific
Segment Reporting Information [Line Items]
Revenue	155	149
Asia-Pacific | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	85	78
Asia-Pacific | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	70	71
Americas
Segment Reporting Information [Line Items]
Revenue	120	98
Americas | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	61	55
Americas | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 59	$ 43