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Intangible Assets - Changes in Carrying Amount of Goodwill (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2026
USD ($)
Goodwill [Roll Forward]  
Beginning Balance $ 22,593
Goodwill acquired during the period 201
Goodwill true-ups due to appraisals and other acquisition adjustments (see Note 3) 179
Foreign currency translation adjustments during the period (15)
Ending Balance 22,958
Brokerage  
Goodwill [Roll Forward]  
Beginning Balance 22,078
Goodwill acquired during the period 188
Goodwill true-ups due to appraisals and other acquisition adjustments (see Note 3) 180
Foreign currency translation adjustments during the period (22)
Ending Balance 22,424
Risk Management  
Goodwill [Roll Forward]  
Beginning Balance 497
Goodwill acquired during the period 13
Goodwill true-ups due to appraisals and other acquisition adjustments (see Note 3) (1)
Foreign currency translation adjustments during the period 8
Ending Balance 517
Corporate  
Goodwill [Roll Forward]  
Beginning Balance 18
Goodwill acquired during the period 0
Goodwill true-ups due to appraisals and other acquisition adjustments (see Note 3) 0
Foreign currency translation adjustments during the period (1)
Ending Balance $ 17