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Goodwill And Other Acquired Intangible Assets - Activity in Goodwill (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Roll Forward]    
Beginning balance, goodwill gross $ 5,968 $ 5,851
Beginning balance, accumulated impairment charge (12) (12)
Beginning balance, goodwill net 5,956 5,839
Additions/adjustments 209 3
Foreign currency translation adjustments (171) 114
Ending balance, goodwill gross 6,006 5,968
Ending balance, accumulated impairment charge (12) (12)
Ending balance, goodwill net 5,994 5,956
MA    
Goodwill [Roll Forward]    
Beginning balance, goodwill gross 5,681 5,474
Beginning balance, accumulated impairment charge (12) (12)
Beginning balance, goodwill net 5,669 5,462
Additions/adjustments 112 90
Foreign currency translation adjustments (167) 117
Ending balance, goodwill gross 5,626 5,681
Ending balance, accumulated impairment charge (12) (12)
Ending balance, goodwill net 5,614 5,669
MIS    
Goodwill [Roll Forward]    
Beginning balance, goodwill gross 287 377
Beginning balance, accumulated impairment charge 0 0
Beginning balance, goodwill net 287 377
Additions/adjustments 97 (87)
Foreign currency translation adjustments (4) (3)
Ending balance, goodwill gross 380 287
Ending balance, accumulated impairment charge 0 0
Ending balance, goodwill net $ 380 $ 287