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Goodwill - Changes in Carrying Value of Goodwill by Reportable Segment (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2024 USD ($)
Goodwill [Line Items] |
Beginning balance | $ 7,341
Goodwill of acquired businesses | 120
Goodwill adjustment during measurement period | 7
Foreign currency translation adjustments during the year | 109
Ending balance | 7,577
Retail |
Goodwill [Line Items] |
Beginning balance | 4,870
Goodwill of acquired businesses | 119
Goodwill adjustment during measurement period | (37)
Foreign currency translation adjustments during the year | 80
Ending balance | 5,032
Programs |
Goodwill [Line Items] |
Beginning balance | 1,853
Goodwill of acquired businesses | 0
Goodwill adjustment during measurement period | 38
Foreign currency translation adjustments during the year | 22
Ending balance | 1,913
Wholesale Brokerage |
Goodwill [Line Items] |
Beginning balance | 618
Goodwill of acquired businesses | 1
Goodwill adjustment during measurement period | 6
Foreign currency translation adjustments during the year | 7
Ending balance | $ 632

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