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Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2025
Segment Reporting [Abstract] |
Schedule of Reportable Operating Segments, Consolidated Revenue and Segment Operating Income | The following tables include information about Aon’s reportable segments, including total segment revenue, consolidated revenue, segment operating income, and income before income taxes:
| Three Months Ended September 30,
| Risk Capital |  | Human Capital |  | Corporate/Eliminations |  | Total Consolidated
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue (1) | $2,525 |  | $2,355 |  | $1,475 |  | $1,369 |  | $(3) |  | $(3) |  | $3,997 |  | $3,721
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits | 1,455 |  | 1,368 |  | 776 |  | 740 |  | 28 |  | 42 |  | 2,259 |  | 2,150
Information technology | 94 |  | 93 |  | 44 |  | 47 |  | 2 |  | 1 |  | 140 |  | 141
Premises | 56 |  | 57 |  | 28 |  | 31 |  | 1 |  | — |  | 85 |  | 88
Other expenses (2) | 335 |  | 276 |  | 295 |  | 349 |  | 67 |  | 94 |  | 697 |  | 719
Total operating expenses | 1,940 |  | 1,794 |  | 1,143 |  | 1,167 |  | 98 |  | 137 |  | 3,181 |  | 3,098
Operating income | $585 |  | $561 |  | $332 |  | $202 |  | $(101) |  | $(140) |  | $816 |  | $623
Operating margin | 23.2% |  | 23.8% |  | 22.5% |  | 14.8% |  |  |  |  |  | 20.4% |  | 16.7%
Non-operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | — |  | 4
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (206) |  | (213)
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  |  | (13) |  | 35
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | $597 |  | $449
| Nine Months Ended September 30,
| Risk Capital |  | Human Capital |  | Corporate/Eliminations |  | Total Consolidated
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue (1) | $8,582 |  | $7,980 |  | $4,311 |  | $3,597 |  | $(12) |  | $(26) |  | $12,881 |  | $11,551
Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation and benefits | 4,457 |  | 4,112 |  | 2,346 |  | 1,977 |  | 65 |  | 74 |  | 6,868 |  | 6,163
Information technology | 272 |  | 275 |  | 134 |  | 121 |  | 6 |  | 1 |  | 412 |  | 397
Premises | 162 |  | 161 |  | 87 |  | 80 |  | 3 |  | — |  | 252 |  | 241
Other expenses (2) | 1,045 |  | 902 |  | 892 |  | 740 |  | 276 |  | 364 |  | 2,213 |  | 2,006
Total operating expenses | 5,936 |  | 5,450 |  | 3,459 |  | 2,918 |  | 350 |  | 439 |  | 9,745 |  | 8,807
Operating income | $2,646 |  | $2,530 |  | $852 |  | $679 |  | $(362) |  | $(465) |  | $3,136 |  | $2,744
Operating margin | 30.8% |  | 31.7% |  | 19.8% |  | 18.9% |  |  |  |  |  | 24.3% |  | 23.8%
Non-operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  | 63
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  | (624) |  | (582)
Other income (expense) |  |  |  |  |  |  |  |  |  |  |  |  | 33 |  | 346
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  | $2,550 |  | $2,571
(1)Includes fiduciary investment income of $72 million and $201 million, respectively, in Risk Capital and $3 million and $7 million, respectively, in Human Capital for the three and nine months ended September 30, 2025. Includes fiduciary investment income of $83 million and $234 million, respectively, in Risk Capital and $2 million and $5 million, respectively, in Human Capital for the three and nine months ended September 30, 2024. (2)Includes expenses related to Depreciation of fixed assets, Amortization and impairment of intangible assets, Accelerating Aon United Program expenses, and Other general expenses.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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