v3.26.1
Segment Information (Tables)
 6 Months Ended
Jun. 30, 2026
Segment Reporting [Abstract]  
Schedule of Reportable Operating Segments, Consolidated Revenue and Segment Operating Income
The following tables include information about Aon’s reportable segments, including total segment revenue, total consolidated revenue, segment operating income, and income before income taxes:
Three Months Ended June 30,
Risk CapitalHuman CapitalCorporate/EliminationsTotal Consolidated
20262025202620252026202520262025
Revenue
Total revenue (1)
$3,006$2,866$1,244$1,291$(4)$(2)$4,246$4,155
Expenses
Compensation and benefits1,5281,54171579628232,2712,360
Information technology10688514553162136
Premises56542830118585
Other expenses (2)
40031928330313093813715
Total operating expenses2,0902,0021,0771,1741641203,3313,296
Operating income$916$864$167$117$(168)$(122)$915$859
Operating margin30.5%30.1%13.4%9.1%21.5%20.7%
Non-operating expenses
Interest income5—
Interest expense(179)(212)
Other income (expense)(17)56
Income before income taxes$724$703
Six Months Ended June 30,
Risk CapitalHuman CapitalCorporate/EliminationsTotal Consolidated
20262025202620252026202520262025
Revenue
Total revenue (1)
$6,508$6,057$2,783$2,836$(11)$(9)$9,280$8,884
Expenses
Compensation and benefits3,1603,0021,4741,57030374,6644,609
Information technology202178979074306272
Premises109106555922166167
Other expenses (2)
7397105475972282091,5141,516
Total operating expenses4,2103,9962,1732,3162672526,6506,564
Operating income$2,298$2,061$610$520$(278)$(261)$2,630$2,320
Operating margin35.3%34.0%21.9%18.3%28.3%26.1%
Non-operating expenses
Interest income175
Interest expense(358)(418)
Other income (expense)(12)46
Income before income taxes$2,277$1,953
(1)Includes fiduciary investment income for the three and six months ended June 30, 2026 of $56 million and $109 million, respectively, in Risk Capital and $2 million and $4 million, respectively, in Human Capital. For the three and six months ended June 30, 2025, includes fiduciary investment income of $60 million and $125 million, respectively, in Risk Capital and $1 million and $2 million, respectively, in Human Capital.
(2)Includes expenses related to Depreciation of fixed assets, Amortization and impairment of intangible assets, Accelerating Aon United Program expenses, and Other general expenses.