v3.26.1
Employee Benefits (Tables)
 6 Months Ended
Jun. 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 June 30,
 
U.K.
U.S.
Other
 202620252026202520262025
Service cost$— $— $— $— $— $— 
Interest cost36 39 23 25 12 10 
Expected return on plan assets, net of administration expenses(48)(45)(29)(30)(15)(14)
Amortization of prior-service cost2 — — — — — 
Amortization of net actuarial loss20 22 11 9 3 4 
Net periodic cost $10 $16 $5 $4 $— $— 
 Six Months Ended June 30,
 
U.K.
U.S.
Other
 202620252026202520262025
Service cost$— $— $— $— $— $— 
Interest cost73 76 47 51 23 19 
Expected return on plan assets, net of administration expenses(96)(88)(59)(60)(30)(26)
Amortization of prior-service cost2 1 — — — — 
Amortization of net actuarial loss40 44 22 18 7 7 
Net periodic cost$19 $33 $10 $9 $— $— 
Schedule of Employer's Contributions The following table summarizes contributions made to the Company’s significant pension plans (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2026202520262025
Contributions to U.K. pension plans
$1 $1 $1 $2 
Contributions to U.S. pension plans
19 17 45 44 
Contributions to other major pension plans4 6 6 8 
Total contributions$24 $24 $52 $54