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Goodwill - Changes in Carrying Value of Goodwill by Reportable Segment (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2025
USD ($)
Goodwill [Line Items]  
Beginning balance $ 7,970
Goodwill of acquired businesses 56
Goodwill adjustments during measurement period (1)
Goodwill disposed of relating to sales of businesses (5)
Foreign currency translation adjustments during the year 91
Ending balance 8,111
Retail  
Goodwill [Line Items]  
Beginning balance 5,436
Goodwill of acquired businesses 3
Goodwill adjustments during measurement period (1)
Goodwill disposed of relating to sales of businesses (5)
Foreign currency translation adjustments during the year 74
Ending balance 5,507
Programs  
Goodwill [Line Items]  
Beginning balance 1,884
Goodwill of acquired businesses 20
Goodwill adjustments during measurement period 0
Goodwill disposed of relating to sales of businesses 0
Foreign currency translation adjustments during the year 13
Ending balance 1,917
Wholesale Brokerage  
Goodwill [Line Items]  
Beginning balance 650
Goodwill of acquired businesses 33
Goodwill adjustments during measurement period 0
Goodwill disposed of relating to sales of businesses 0
Foreign currency translation adjustments during the year 4
Ending balance $ 687