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Revenues - Consolidated Revenue Information by Geographic Area (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 7,088	$ 5,916	$ 5,468
Operating Segments
Segment Reporting Information [Line Items]
Revenue	7,088	5,916	5,468
MA
Segment Reporting Information [Line Items]
Revenue	3,295	3,056	2,769
MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	3,308	3,069	2,777
MIS
Segment Reporting Information [Line Items]
Revenue	3,793	2,860	2,699
MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	3,986	3,046	2,873
U.S.
Segment Reporting Information [Line Items]
Revenue	3,836	3,071	2,865
U.S. | MA
Segment Reporting Information [Line Items]
Revenue	1,390	1,321	1,231
U.S. | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	1,390	1,321	1,231
U.S. | MIS
Segment Reporting Information [Line Items]
Revenue	2,446	1,750	1,634
U.S. | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	2,446	1,750	1,634
Non-U.S.
Segment Reporting Information [Line Items]
Revenue	3,252	2,845	2,603
Non-U.S. | MA
Segment Reporting Information [Line Items]
Revenue	1,905	1,735	1,538
Non-U.S. | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	1,905	1,735	1,538
Non-U.S. | MIS
Segment Reporting Information [Line Items]
Revenue	1,347	1,110	1,065
Non-U.S. | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	1,347	1,110	1,065
EMEA
Segment Reporting Information [Line Items]
Revenue	2,174	1,886	1,708
EMEA | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	1,306	1,207	1,060
EMEA | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	868	679	648
Asia-Pacific
Segment Reporting Information [Line Items]
Revenue	629	570	539
Asia-Pacific | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	345	299	268
Asia-Pacific | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	284	271	271
Americas
Segment Reporting Information [Line Items]
Revenue	449	389	356
Americas | MA | Operating Segments
Segment Reporting Information [Line Items]
Revenue	254	229	210
Americas | MIS | Operating Segments
Segment Reporting Information [Line Items]
Revenue	$ 195	$ 160	$ 146

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