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Other Financial Data (Tables)
 12 Months Ended
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
202420232022
Gain from disposals of business$337 $4 $54 
Equity earnings10 5 10 
Foreign currency remeasurement8 (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):
202420232022
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 3120242023
Costs to fulfill contracts with customers (1)
$424 $370 
Prepaid expenses135 100 
Taxes receivable43 35 
Assets held for sale1 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 3120242023
Software$981 $983 
Leasehold improvements437 430 
Furniture, fixtures, and equipment297 269 
Computer equipment271 294 
Construction in progress133 130 
Other27 30 
Fixed assets, gross
2,146 2,136 
Less: Accumulated depreciation1,509 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 3120242023
Costs to obtain contracts with customers (1)
$207 $195 
Taxes receivable90 100 
Investments90 45 
Leases (2)
9 26 
Other602 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 3120242023
Deferred revenue (1)
$280 $270 
Taxes payable260 291 
Leases (2)
191 182 
Contingent consideration93 — 
Liabilities held for sale— 69 
Other949 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 3120242023
Taxes payable (1)
$885 $827 
Contingent consideration104 — 
Compensation and benefits payable61 59 
Deferred revenue30 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.