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Goodwill (Tables) | 9 Months Ended
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Sep. 30, 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 nine months ended September 30, 2024 are as follows:
(in millions) |  | Retail (2) |  |  | Programs |  |  | Wholesale Brokerage |  |  | Total |
Balance as of December 31, 2023 |  | $ | 4,870 |  |  | $ | 1,853 |  |  | $ | 618 |  |  | $ | 7,341 |
Goodwill of acquired businesses |  |  | 119 |  |  |  | — |  |  |  | 1 |  |  |  | 120 |
Goodwill adjustment during measurement period (1) |  |  | (37 | ) |  |  | 38 |  |  |  | 6 |  |  |  | 7 |
Foreign currency translation adjustments during the year |  |  | 80 |  |  |  | 22 |  |  |  | 7 |  |  |  | 109 |
Balance as of September 30, 2024 |  | $ | 5,032 |  |  | $ | 1,913 |  |  | $ | 632 |  |  | $ | 7,577 |
(1) Provisional estimates of fair value of acquired assets and liabilities are established at the time of each acquisition and are subsequently reviewed and finalized within the first year of operations subsequent to the acquisition date to determine the necessity for adjustments to goodwill. (2) The December 31, 2023 Retail segment balance includes $127 million of goodwill reclassified from the former Services segment as a result of our segment realignment.

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