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Other Financial Data | 12 Months Ended
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Dec. 31, 2024
Other Financial Data [Abstract] |
Other Financial Data | Other Financial Data Consolidated Statements of Income Information 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. Consolidated Statements of Financial Position Information 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 |
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. 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 |
Depreciation expense, which includes software amortization, was $183 million, $167 million, and $151 million for the years ended December 31, 2024, 2023, and 2022, respectively. 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. 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. 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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