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Accelerating Aon United Program | 9 Months Ended
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Sep. 30, 2025
Restructuring and Related Activities [Abstract] |
Accelerating Aon United Program | Accelerating Aon United Program In the third quarter of 2023, Aon initiated a three-year restructuring program called the Accelerating Aon United Program (the “Program” or the “AAU Program”) with the purpose of streamlining the Company’s technology infrastructure, optimizing its leadership structure and resource alignment, and reducing its real estate footprint to align to its hybrid working strategy. The Program includes technology-related costs to facilitate streamlining and simplifying operations, headcount reduction costs, and costs associated with asset impairments, including real estate consolidation and technology costs. The Program is an investment in the Company’s 3x3 Plan that brings together the best of the firm through its Aon United strategy, delivered as Risk Capital and Human Capital, and Aon’s Client Leadership model, powered by Aon Business Services. Program charges are recognized within Accelerating Aon United Program expenses on the accompanying Condensed Consolidated Statements of Income and consist of the following cost activities: •Technology and other – includes costs associated with actions taken to rationalize applications and to optimize technology across the Company. These costs may include termination fees and other non-capitalizable costs associated with Program initiatives, which include professional service fees. •Workforce optimization – includes costs associated with headcount reduction and other separation-related costs. •Asset impairments – includes non-cash costs associated with impairment of assets, as they are identified, including ROU lease assets, leasehold improvements, and other capitalized assets no longer providing economic benefit. The Program is currently expected to result in cumulative costs of $1.0 billion, consisting of approximately $0.9 billion of cash charges and approximately $0.1 billion of non-cash charges. For the three and nine months ended September 30, 2025, total Program costs incurred were $32 million and $236 million, respectively. Over the life of the Program, the Risk Capital segment is expected to incur approximately $230 million of charges, while the Human Capital segment is expected to incur approximately $60 million of charges, with the remaining charges relating to corporate expenses. Total Program costs incurred for the three and nine months ended September 30, 2025 and 2024 are as follows (in millions):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Risk Capital (1) |  | $ | (3) |  |  | $ | 11 |  |  | $ | 48 |  |  | $ | 103 |
Human Capital (1) |  | (1) |  |  | 4 |  |  | 9 |  |  | 27 |
Corporate |  | 36 |  |  | 54 |  |  | 179 |  |  | 190 |
Total |  | $ | 32 |  |  | $ | 69 |  |  | $ | 236 |  |  | $ | 320 |
(1)Risk Capital and Human Capital Program costs reflect changes in accruals made in the current period related to Workforce optimization. The changes in the Company’s liabilities for the Program as of September 30, 2025 are as follows (in millions):
| Technology and other |  | Workforce optimization |  | Asset impairments |  | Total
Liability balance as of December 31, 2024 | $ | 17 |  |  | $ | 97 |  |  | $ | — |  |  | $ | 114 |
Charges | 138 |  |  | 91 |  |  | 7 |  |  | 236 |
Cash payments | (124) |  |  | (110) |  |  | — |  |  | (234) |
Foreign currency translation and other | — |  |  | 5 |  |  | — |  |  | 5 |
Non-cash charges | (7) |  |  | (17) |  |  | (7) |  |  | (31) |
Liability balance as of September 30, 2025 | $ | 24 |  |  | $ | 66 |  |  | $ | — |  |  | $ | 90 |
Total costs incurred from inception to date | $ | 278 |  |  | $ | 391 |  |  | $ | 91 |  |  | $ | 760 |
The Company’s unpaid liabilities for charges under the Program are primarily included in Accounts payable and accrued liabilities and Other non-current liabilities in the Condensed Consolidated Statements of Financial Position.

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- Definition The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/420/tableOfContent Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details
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