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Segment Information - Financial Information by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue $ 2,007 $ 1,813 $ 5,829 $ 5,416
Labor and Related Expense 635 668 1,912 1,890
Non-Compensation Expense 310 278 895 851
Operating, SG&A 945 946 2,807 2,741
Adjusted Operating Income 1,062 867 3,022 2,675
Depreciation and amortization 123 108 356 318
Restructuring 21 6 81 13
Charges related to asset abandonment 1 15 4 30
Operating income 917 738 2,581 2,314
Non-operating (expense) income, net (50) (35) (138) (140)
Income before provision for income taxes 867 703 2,443 2,174
Eliminations        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue (53) (51) (158) (154)
Intersegment Expense   (51)   (154)
Operating, SG&A (53) (51) (158) (154)
Adjusted Operating Income 0 0 0 0
Depreciation and amortization 0 0 0 0
Restructuring 0 0 0 0
Charges related to asset abandonment 0 0 0 0
MA        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue 909 831 2,656 2,432
Labor and Related Expense 352 350 1,069 1,023
Non-Compensation Expense 197 183 589 554
MA | Eliminations        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue 3 3 9 10
Intersegment Expense 50 48 149 144
MA | Operating Segments        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue 912 834 2,665 2,442
Operating, SG&A 599 581 1,807 1,721
Adjusted Operating Income 313 253 858 721
Depreciation and amortization 101 88 292 260
Restructuring 15 4 59 7
Charges related to asset abandonment 1 15 4 30
MIS        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue 1,098 982 3,173 2,984
Labor and Related Expense 283 318 843 867
Non-Compensation Expense 113 95 306 297
MIS | Eliminations        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue 50 48 149 144
Intersegment Expense 3 3 9 10
MIS | Operating Segments        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue 1,148 1,030 3,322 3,128
Operating, SG&A 399 416 1,158 1,174
Adjusted Operating Income 749 614 2,164 1,954
Depreciation and amortization 22 20 64 58
Restructuring 6 2 22 6
Charges related to asset abandonment $ 0 $ 0 $ 0 $ 0