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Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2026
Goodwill and Intangible Assets Disclosure [Abstract]  
Carrying Amount of Goodwill Allocated by Domestic and Foreign Operations
The carrying amount of goodwill at March 31, 2026 and December 31, 2025 allocated by domestic and foreign operations is as follows (in millions):
  BrokerageRisk
Management		CorporateTotal
At March 31, 2026
United States$15,668 $109 $— $15,777 
United Kingdom3,468 139 — 3,607 
Canada624 — — 624 
Australia632 247 — 879 
New Zealand225 9 — 234 
Other foreign1,807 13 17 1,837 
Total goodwill$22,424 $517 $17 $22,958 
At December 31, 2025
United States$16,428 $109 $— $16,537 
United Kingdom2,889 142 — 3,031 
Canada628 — — 628 
Australia591 238 — 829 
New Zealand225 8 — 233 
Other foreign1,317 — 18 1,335 
Total goodwill$22,078 $497 $18 $22,593 
Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill for the three-month period ended March 31, 2026 are as follows (in millions):
BrokerageRisk
Management		CorporateTotal
Balance as of December 31, 2025$22,078 $497 $18 $22,593 
Goodwill acquired during the period188 13 — 201 
Goodwill true-ups due to appraisals and other acquisition adjustments (see Note 3)180 (1)— 179 
Foreign currency translation adjustments during the period(22)8 (1)(15)
Balance as of March 31, 2026$22,424 $517 $17 $22,958 
Major Classes of Amortizable Intangible Assets
Major classes of amortizable intangible assets at March 31, 2026 and December 31, 2025 consist of the following (in millions):
 March 31,
2026		December 31,
2025
Expiration lists$15,840 $15,968 
Accumulated amortization - expiration lists(5,556)(5,357)
10,284 10,611 
Non-compete agreements138 125 
Accumulated amortization - non-compete agreements(102)(98)
36 27 
Trade names103 160 
Accumulated amortization - trade names(57)(114)
46 46 
Net amortizable assets$10,366 $10,684 
Estimated Aggregate Amortization Expense
Estimated aggregate amortization expense for each of the next five years and thereafter is as follows (in millions):
2026 (remaining nine months)$831 
20271,080 
20281,037 
2029978 
2030920 
Thereafter5,520 
Total$10,366