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Segment Information - Financial Information by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue $ 1,898 $ 1,817 $ 3,822 $ 3,603
Labor and Related Expense 635 613 1,277 1,222
Non-Compensation Expense 297 302 585 573
Operating, SG&A 932 915 1,862 1,795
Adjusted Operating Income 966 902 1,960 1,808
Depreciation and amortization 120 110 233 210
Restructuring 27 2 60 7
Charges related to asset abandonment 1 15 3 15
Operating income 818 775 1,664 1,576
Non-operating (expense) income, net (46) (56) (88) (105)
Income before provision for income taxes 772 719 1,576 1,471
Eliminations        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue (53) (53) (105) (103)
Intersegment Expense   (53)   (103)
Operating, SG&A (53) (53) (105) (103)
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 888 802 1,747 1,601
Labor and Related Expense 355 336 717 673
Non-Compensation Expense 200 191 392 371
MA | Eliminations        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue 3 4 6 7
Intersegment Expense 50 49 99 96
MA | Operating Segments        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue 891 806 1,753 1,608
Operating, SG&A 605 576 1,208 1,140
Adjusted Operating Income 286 230 545 468
Depreciation and amortization 97 90 191 172
Restructuring 18 1 44 3
Charges related to asset abandonment 1 15 3 15
MIS        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue 1,010 1,015 2,075 2,002
Labor and Related Expense 280 277 560 549
Non-Compensation Expense 97 111 193 202
MIS | Eliminations        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue 50 49 99 96
Intersegment Expense 3 4 6 7
MIS | Operating Segments        
Segment Reporting Information, Operating Income (Loss) [Abstract]        
Revenue 1,060 1,064 2,174 2,098
Operating, SG&A 380 392 759 758
Adjusted Operating Income 680 672 1,415 1,340
Depreciation and amortization 23 20 42 38
Restructuring 9 1 16 4
Charges related to asset abandonment $ 0 $ 0 $ 0 $ 0