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Segment Information - Financial Information by Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	$ 1,924	$ 1,786
Labor and Related Expense	642	609
Non-Compensation Expense	288	271
Operating, SG&A	930	880
Adjusted Operating Income	994	906
Depreciation and amortization	113	100
Restructuring	33	5
Charges related to asset abandonment	2	0
Operating income	846	801
Eliminations
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	(52)	(50)
Intersegment Expense	(52)	(50)
Operating, SG&A	(52)	(50)
Adjusted Operating Income	0	0
Depreciation and amortization	0	0
Restructuring	0	0
Charges related to asset abandonment	0	0
MA
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	859	799
Labor and Related Expense	362	337
Non-Compensation Expense	192	180
MA | Eliminations
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	3	3
Intersegment Expense	49	47
MA | Operating Segments
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	862	802
Operating, SG&A	603	564
Adjusted Operating Income	259	238
Depreciation and amortization	94	82
Restructuring	26	2
Charges related to asset abandonment	2	0
MIS
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	1,065	987
Labor and Related Expense	280	272
Non-Compensation Expense	96	91
MIS | Eliminations
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	49	47
Intersegment Expense	3	3
MIS | Operating Segments
Segment Reporting Information, Operating Income (Loss) [Abstract]
Revenue	1,114	1,034
Operating, SG&A	379	366
Adjusted Operating Income	735	668
Depreciation and amortization	19	18
Restructuring	7	3
Charges related to asset abandonment	$ 0	$ 0

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