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Segment Information - Financial Information by Segment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information, Operating Income (Loss) [Abstract]      
Revenue $ 7,088 $ 5,916 $ 5,468
Compensation expense 2,539 2,241 2,056
Non-compensation expense 1,141 1,078 1,084
Operating, SG&A 3,680 3,319 3,140
Adjusted Operating Income 3,408 2,597 2,328
Depreciation and amortization 431 373 331
Restructuring 59 87 114
Charges related to asset abandonment 43 0 0
Operating income 2,875 2,137 1,883
Non-operating (expense) income, net (176) (202) (123)
Income before provision for income taxes 2,699 1,935 1,760
Eliminations      
Segment Reporting Information, Operating Income (Loss) [Abstract]      
Revenue (206) (199) (182)
Intersegment expense (206) (199) (182)
Operating, SG&A (206) (199) (182)
Adjusted Operating Income 0 0 0
Depreciation and amortization 0 0 0
Restructuring 0 0 0
Operating Segments      
Segment Reporting Information, Operating Income (Loss) [Abstract]      
Revenue 7,088 5,916 5,468
MA      
Segment Reporting Information, Operating Income (Loss) [Abstract]      
Revenue 3,295 3,056 2,769
Compensation expense 1,370 1,238 1,116
Non-compensation expense 731 708 647
MA | Eliminations      
Segment Reporting Information, Operating Income (Loss) [Abstract]      
Revenue 13 13 8
Intersegment expense 193 186 174
MA | Operating Segments      
Segment Reporting Information, Operating Income (Loss) [Abstract]      
Revenue 3,308 3,069 2,777
Operating, SG&A 2,294 2,132 1,937
Adjusted Operating Income 1,014 937 840
Depreciation and amortization 353 298 250
Restructuring 42 59 49
Charges related to asset abandonment 43 0  
MIS      
Segment Reporting Information, Operating Income (Loss) [Abstract]      
Revenue 3,793 2,860 2,699
Compensation expense 1,169 1,003 940
Non-compensation expense 410 370 437
MIS | Eliminations      
Segment Reporting Information, Operating Income (Loss) [Abstract]      
Revenue 193 186 174
Intersegment expense 13 13 8
MIS | Operating Segments      
Segment Reporting Information, Operating Income (Loss) [Abstract]      
Revenue 3,986 3,046 2,873
Operating, SG&A 1,592 1,386 1,385
Adjusted Operating Income 2,394 1,660 1,488
Depreciation and amortization 78 75 81
Restructuring 17 28 $ 65
Charges related to asset abandonment $ 0 $ 0