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Other Financial Data (Tables)
 6 Months Ended
Jun. 30, 2025
Other Financial Data [Abstract]  
Schedule of Other Income (Expense)
Other income (expense) consists of the following (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
Extinguishment of debt$— $(6)$— $(6)
Gain from sales of businesses— 257 — 257 
Equity earnings3 1 1 3 
Pension and other postretirement(21)(11)(44)(21)
Foreign currency remeasurement(38)5 (54)9 
Financial instruments and other (1)
112 (10)143 69 
Total
$56 $236 $46 $311 
(1)During the three and six months ended June 30, 2025, an $88 million and $108 million gain was recognized, respectively, compared to $82 million recognized for the six months ended June 30, 2024, which was all recognized in the first quarter of 2024. 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 June 30,Six Months Ended June 30,
2025202420252024
Balance at beginning of period$74 $81 $75 $79 
Provision3 6 6 11 
Accounts written off, net of recoveries(1)— (6)(2)
Foreign currency translation and other3 — 4 (1)
Balance at end of period$79 $87 $79 $87 
Schedule of Other Current Assets
The components of Other current assets are as follows (in millions):
As ofJune 30,
2025		December 31,
2024
Costs to fulfill contracts with customers (1)
$273 $424 
Prepaid expenses170 135 
Taxes receivable89 43 
Other (2)
322 157 
Total$854 $759 
(1)Refer to Note 3 “Revenue from Contracts with Customers” for further information.
(2)Includes $1 million as of December 31, 2024 that was previously classified as “Assets held for sale” 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.
Schedule of Other Non-current Assets
The components of Other non-current assets are as follows (in millions):
As of June 30,
2025		December 31,
2024
Costs to obtain contracts with customers (1)
$187 $207 
Investments101 90 
Taxes receivable84 90 
Other (2) (3)
200 611 
Total$572 $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)Includes $416 million as of December 31, 2024 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 ofJune 30,
2025		December 31,
2024
Deferred revenue (1)
$385 $280 
Leases185 191 
Taxes payable166 260 
Contingent consideration58 93 
Other1,473 949 
Total
$2,267 $1,773 
(1)During the three and six months ended June 30, 2025, revenue of $236 million and $466 million, respectively, was recognized in the Condensed Consolidated Statements of Income that was previously deferred. During the three and six months ended June 30, 2024, revenue of $199 million and $378 million, respectively, was recognized in the Condensed Consolidated Statements of Income that was previously deferred.
Schedule of Other Non-current Liabilities
The components of Other non-current liabilities are as follows (in millions):
As ofJune 30,
2025		December 31,
2024
Taxes payable $961 $885 
Contingent consideration113 104 
Compensation and benefits55 61 
Deferred revenue34 30 
Other86 64 
Total
$1,249 $1,144