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Other Financial Data (Tables)
 9 Months Ended
Sep. 30, 2025
Other Financial Data [Abstract]  
Schedule of 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.
Schedule of 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 
Schedule of 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.
Schedule of 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.
Schedule of 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.
Schedule of 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