Goodwill (Tables)

12 Months Ended

Dec. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Value of Goodwill by Reportable Segment

The changes in the carrying value of goodwill by reportable segment for the years ended December 31, are as follows:

(in millions)	Retail (1)			Programs (1)			Wholesale Brokerage			Total
Balance as of January 1, 2023	$	4,436		$	1,646		$	592		$	6,674
Goodwill of acquired businesses		335			263			23			621
Goodwill adjustment during measurement period (2)		13			(23	)		(2	)		(12	)
Goodwill disposed of relating to sales of businesses		—			(47	)		—			(47	)
Foreign currency translation adjustments during the year		86			14			5			105
Balance as of December 31, 2023	$	4,870		$	1,853		$	618		$	7,341
Goodwill of acquired businesses		671			—			27			698
Goodwill adjustment during measurement period (2)		(37	)		40			6			9
Goodwill disposed of relating to sales of businesses		(13	)		—			—			(13	)
Foreign currency translation adjustments during the year		(55	)		(9	)		(1	)		(65	)
Balance as of December 31, 2024	$	5,436		$	1,884		$	650		$	7,970

(1)2023 balances and activity reflect reclassifications from the former Services segment as a result of our segment realignment in 2024.

(2)Provisional estimates of fair value are established at the time of each acquisition and are subsequently reviewed and finalized within the first year of operations subsequent to the acquisition dates. As of December 31, 2024, adjustments were made to the amounts initially recorded. See also Note 3.