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Goodwill And Other Acquired Intangible Assets - Activity in Goodwill (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Goodwill [Roll Forward]    
Beginning balance, goodwill gross $ 6,006 $ 5,968
Beginning balance, Accumulated impairment charge (12) (12)
Beginning balance, goodwill net 5,994 5,956
Additions/ adjustments 144 209
Foreign currency translation adjustments 336 (171)
Ending balance, goodwill gross 6,477 6,006
Ending balance, Accumulated impairment charge (12) (12)
Ending balance, goodwill net 6,465 5,994
Disposal Group, Held-for-sale, Not Discontinued Operations    
Goodwill [Roll Forward]    
Reclassification to assets held for sale (9)  
MA    
Goodwill [Roll Forward]    
Beginning balance, goodwill gross 5,626 5,681
Beginning balance, Accumulated impairment charge (12) (12)
Beginning balance, goodwill net 5,614 5,669
Additions/ adjustments 136 112
Foreign currency translation adjustments 336 (167)
Ending balance, goodwill gross 6,089 5,626
Ending balance, Accumulated impairment charge (12) (12)
Ending balance, goodwill net 6,077 5,614
MA | Disposal Group, Held-for-sale, Not Discontinued Operations    
Goodwill [Roll Forward]    
Reclassification to assets held for sale (9)  
MIS    
Goodwill [Roll Forward]    
Beginning balance, goodwill gross 380 287
Beginning balance, Accumulated impairment charge 0 0
Beginning balance, goodwill net 380 287
Additions/ adjustments 8 97
Foreign currency translation adjustments 0 (4)
Ending balance, goodwill gross 388 380
Ending balance, Accumulated impairment charge 0 0
Ending balance, goodwill net 388 $ 380
MIS | Disposal Group, Held-for-sale, Not Discontinued Operations    
Goodwill [Roll Forward]    
Reclassification to assets held for sale $ 0