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Goodwill (Tables) | 3 Months Ended
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Mar. 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 three months ended March 31, 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 |  |  | 58 |  |  |  | — |  |  |  | — |  |  |  | 58 |
Goodwill adjustment during measurement period (1) |  |  | 4 |  |  |  | (1 | ) |  |  | 5 |  |  |  | 8 |
Foreign currency translation adjustments during the year |  |  | (18 | ) |  |  | (3 | ) |  |  | — |  |  |  | (21 | )
Balance as of March 31, 2024 |  | $ | 4,914 |  |  | $ | 1,849 |  |  | $ | 623 |  |  | $ | 7,386 |
(1) 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 date to determine the necessity for adjustments. (2) The December 31, 2023 Retail balance includes $127 million of goodwill reclassified from the former Services segment as a result of our segment realignment.

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