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Other Financial Data
 9 Months Ended
Sep. 30, 2025
Other Financial Data [Abstract]  
Other Financial Data Other Financial Data
Condensed Consolidated Statements of Income Information
Other Income (Expense)
Other income (expense) consists of the following (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Pension and other postretirement$(21)$(14)$(65)$(35)
Extinguishment of debt— (1)— (7)
Gain from sales of businesses1 76 1 333 
Equity earnings4 2 5 5 
Foreign currency remeasurement11 (30)(43)(21)
Financial instruments and other (1)
(8)2 135 71 
Total$(13)$35 $33 $346 
(1)During the nine months ended September 30, 2025, a gain of $108 million was recognized, which was all recognized in the first six months of 2025. During the three and nine months ended September 30, 2024, a $2 million and $84 million gain was recognized, respectively. These gains are 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 7 “Acquisitions and Dispositions of Businesses” for additional information.
Condensed 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):
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Balance at beginning of period$79 $87 $75 $79 
Provision4 2 10 13 
Accounts written off, net of recoveries(9)(6)(15)(8)
Foreign currency translation and other— 2 4 1 
Balance at end of period$74 $85 $74 $85 
Other Current Assets
The components of Other current assets are as follows (in millions):
As ofSeptember 30,
2025		December 31,
2024
Assets held for sale (1)
$1,274 $1 
Costs to fulfill contracts with customers (2)
320 424 
Prepaid expenses175 135 
Taxes receivable121 43 
Other320 156 
Total$2,210 $759 
(1)Refer to Note 7 “Acquisitions and Dispositions of Businesses” for further information.
(2)Refer to Note 3 “Revenue from Contracts with Customers” for further information.
Other Non-Current Assets
The components of Other non-current assets are as follows (in millions):
As of September 30,
2025		December 31,
2024
Costs to obtain contracts with customers (1)
$190 $207 
Investments163 90 
Taxes receivable101 90 
Other (2) (3)
275 611 
Total$729 $998 
(1)Refer to Note 3 “Revenue from Contracts with Customers” for further information.
(2)Includes $9 million as of December 31, 2024 that was previously classified as “Leases” within Aon’s Annual Report on Form 10-K filed February 18, 2025. The prior year balance has been reclassified to conform to current year presentation.
(3)As of December 31, 2024, includes $416 million of consideration paid into an escrow account related to the acquisition of Griffiths & Armour, which closed on January 1, 2025. Refer to Note 7 “Acquisitions and Dispositions of Businesses” for additional information.
Other Current Liabilities
The components of Other current liabilities are as follows (in millions):
As ofSeptember 30,
2025		December 31,
2024
Deferred revenue (1)
$286 $280 
Leases177 191 
Liabilities held for sale (2)
166 — 
Taxes payable127 260 
Contingent consideration70 93 
Other1,363 949 
Total
$2,189 $1,773 
(1)During the three and nine months ended September 30, 2025, revenue of $258 million and $724 million, respectively, was recognized in the Condensed Consolidated Statements of Income that was previously deferred. During the three and nine months ended September 30, 2024, revenue of $240 million and $618 million, respectively, was recognized in the Condensed Consolidated Statements of Income that was previously deferred.
(2)Refer to Note 7 “Acquisitions and Dispositions of Businesses” for further information.
Other Non-Current Liabilities
The components of Other non-current liabilities are as follows (in millions):
As ofSeptember 30,
2025		December 31,
2024
Taxes payable $979 $885 
Contingent consideration121 104 
Compensation and benefits57 61 
Deferred revenue29 30 
Other30 64 
Total
$1,216 $1,144