v3.26.3
Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2026
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit Cost for the Pension Plans
The following table provides the components of the net periodic cost recognized in the Condensed Consolidated Statements of Income for Aon’s significant U.K., U.S., and other major pension plans, which are located in the Netherlands and Canada. Service cost is reported in Compensation and benefits and all other components are reported in Other income (expense) as follows (in millions):
Three Months Ended September 30,
U.K.
U.S.
Other
202620252026202520262025
Service cost$— $— $— $— $— $— 
Interest cost37 38 23 26 11 10 
Expected return on plan assets, net of administration expenses(48)(46)(30)(30)(15)(13)
Amortization of prior-service cost— 1 — — — — 
Amortization of net actuarial loss20 23 11 8 4 4 
Net periodic cost $9 $16 $4 $4 $— $1 
Nine Months Ended September 30,
U.K.
U.S.
Other
202620252026202520262025
Service cost$— $— $— $— $— $— 
Interest cost110 114 70 77 34 29 
Expected return on plan assets, net of administration expenses(144)(134)(89)(90)(45)(39)
Amortization of prior-service cost2 2 — — — — 
Amortization of net actuarial loss60 67 33 26 11 11 
Net periodic cost$28 $49 $14 $13 $— $1 
Schedule of Employer's Contributions The following table summarizes contributions made to the Company’s significant pension plans (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
2026202520262025
Contributions to U.K. pension plans
$1 $1 $2 $3 
Contributions to U.S. pension plans
25 23 70 67 
Contributions to other major pension plans2 2 8 10 
Total contributions$28 $26 $80 $80