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Other Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2024
Other Financial Data [Abstract] |
Schedule of Components of Other Income (Expense) | The components of Other income (expense) are as follows (in millions):
| Years Ended December 31
| 2024 |  | 2023 |  | 2022
Gain from disposals of business | $ | 337 |  |  | $ | 4 |  |  | $ | 54 |
Equity earnings | 10 |  |  | 5 |  |  | 10 |
Foreign currency remeasurement | 8 |  |  | (99) |  |  | (14) |
Extinguishment of debt | (7) |  |  | — |  |  | — |
Pension and other postretirement (1) | (48) |  |  | (98) |  |  | (179) |
Financial instruments and other (2) | 48 |  |  | 25 |  |  | 4 |
Total | $ | 348 |  |  | $ | (163) |  |  | $ | (125) |
(1)Refer to Note 12 “Employee Benefits” for further information. (2)For the year ended December 31, 2024, an $84 million gain was recognized related to deferred consideration from the affiliates of The Blackstone Group L.P. and the other designated purchasers related to a divestiture completed in a prior year period. Refer to Note 6 “Acquisitions and Dispositions of Businesses” for additional information.
Schedule of Allowance for Doubtful Accounts | Changes in the net carrying amount of allowance for doubtful accounts are as follows (in millions):
| 2024 |  | 2023 |  | 2022
Balance at beginning of period | $ | 79 |  |  | $ | 76 |  |  | $ | 90 |
Provision | 7 |  |  | 13 |  |  | 8 |
Accounts written off, net of recoveries | (8) |  |  | (11) |  |  | (18) |
Foreign currency translation and other | (3) |  |  | 1 |  |  | (4) |
Balance at end of period | $ | 75 |  |  | $ | 79 |  |  | $ | 76 |
Schedule of Other Current Assets | The components of Other current assets are as follows (in millions):
As of December 31 | 2024 |  | 2023
Costs to fulfill contracts with customers (1) | $ | 424 |  |  | $ | 370 |
Prepaid expenses | 135 |  |  | 100 |
Taxes receivable | 43 |  |  | 35 |
Assets held for sale | 1 |  |  | 354 |
Other | 156 |  |  | 137 |
Total | $ | 759 |  |  | $ | 996 |
(1)Refer to Note 3 “Revenue from Contracts with Customers” for further information.
Schedule of Components of Fixed Assets, Net | The components of Fixed assets, net are as follows (in millions):
As of December 31 | 2024 |  | 2023
Software | $ | 981 |  |  | $ | 983 |
Leasehold improvements | 437 |  |  | 430 |
Furniture, fixtures, and equipment | 297 |  |  | 269 |
Computer equipment | 271 |  |  | 294 |
Construction in progress | 133 |  |  | 130 |
Other | 27 |  |  | 30 |
Fixed assets, gross | 2,146 |  |  | 2,136 |
Less: Accumulated depreciation | 1,509 |  |  | 1,498 |
Fixed assets, net | $ | 637 |  |  | $ | 638 |
Schedule of Other Non-current Assets | The components of Other non-current assets are as follows (in millions):
As of December 31 | 2024 |  | 2023
Costs to obtain contracts with customers (1) | $ | 207 |  |  | $ | 195 |
Taxes receivable | 90 |  |  | 100 |
Investments | 90 |  |  | 45 |
Leases (2) | 9 |  |  | 26 |
Other | 602 |  |  | 140 |
Total | $ | 998 |  |  | $ | 506 |
(1)Refer to Note 3 “Revenue from Contracts with Customers” for further information. (2) Refer to Note 9 “Lease Commitments” for further information.
Schedule of Other Current Liabilities | The components of Other current liabilities are as follows (in millions):
As of December 31 | 2024 |  | 2023
Deferred revenue (1) | $ | 280 |  |  | $ | 270 |
Taxes payable | 260 |  |  | 291 |
Leases (2) | 191 |  |  | 182 |
Contingent consideration | 93 |  |  | — |
Liabilities held for sale | — |  |  | 69 |
Other | 949 |  |  | 1,066 |
Total | $ | 1,773 |  |  | $ | 1,878 |
(1)$805 million and $647 million was recognized in the Consolidated Statements of Income during the years ended December 31, 2024 and December 31, 2023, respectively. (2)Refer to Note 9 “Lease Commitments” for further information.
Schedule of Other Non-current Liabilities | The components of Other non-current liabilities are as follows (in millions):
As of December 31 | 2024 |  | 2023
Taxes payable (1) | $ | 885 |  |  | $ | 827 |
Contingent consideration | 104 |  |  | — |
Compensation and benefits payable | 61 |  |  | 59 |
Deferred revenue | 30 |  |  | 33 |
Other (2) | 64 |  |  | 155 |
Total | $ | 1,144 |  |  | $ | 1,074 |
(1)There was no non-current transition tax as of December 31, 2024. There was $72 million of non-current transition tax as of December 31, 2023. Refer to Note 10 “Income Taxes” for further information on the transition tax. (2)Includes $10 million as of December 31, 2023 that was previously classified as “Leases” within Aon’s annual report on Form 10-K filed February 16, 2024. The prior year balance has been reclassified to conform to current year presentation.

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