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Accelerating Aon United Program (Tables) | 6 Months Ended
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Jun. 30, 2024
Restructuring and Related Activities [Abstract] |
Schedule of Restructuring Liabilities for the Program | The changes in the Company’s liabilities for the Program as of June 30, 2024 are as follows (in millions):
| Technology and other |  | Workforce optimization |  | Asset impairments |  | Total
Liability balance as of January 1, 2024 | $ | 14 |  |  | $ | 86 |  |  | $ | — |  |  | $ | 100 |
Charges | 51 |  |  | 145 |  |  | 55 |  |  | 251 |
Cash payments | (29) |  |  | (69) |  |  | — |  |  | (98) |
Foreign currency translation and other | — |  |  | (3) |  |  | — |  |  | (3) |
Non-cash charges (1) | (27) |  |  | (10) |  |  | (55) |  |  | (92) |
Liability balance as of June 30, 2024 | $ | 9 |  |  | $ | 149 |  |  | $ | — |  |  | $ | 158 |
Total costs incurred from inception to date | $ | 65 |  |  | $ | 248 |  |  | $ | 73 |  |  | $ | 386 |
(1)During the three and six months ended June 30, 2024, the Company recognized $12 million and $20 million, respectively, of accelerated ROU asset amortization or impairments due to the Company’s decision to exit certain leased properties as a result of the AAU Program. The amounts are presented in Technology and other, where the corresponding liability is reflected within Other current liabilities and Non-current operating lease liabilities, which will ultimately be settled in cash.

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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.b.2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details
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