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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2025
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 (benefit) 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
 202520242025202420252024
Service cost$— $— $— $— $— $— 
Interest cost38 37 26 23 10 10 
Expected return on plan assets, net of administration expenses(46)(48)(30)(33)(13)(14)
Amortization of prior-service cost1 1 — — — — 
Amortization of net actuarial loss23 21 8 7 4 4 
Net periodic cost (benefit) $16 $11 $4 $(3)$1 $— 
 Nine Months Ended September 30,
 
U.K.
U.S.
Other
 202520242025202420252024
Service cost$— $— $— $— $— $— 
Interest cost114 108 77 69 29 29 
Expected return on plan assets, net of administration expenses(134)(142)(90)(101)(39)(41)
Amortization of prior-service cost2 2 — — — — 
Amortization of net actuarial loss67 62 26 22 11 10 
Net periodic (benefit) cost$49 $30 $13 $(10)$1 $(2)
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,
2025202420252024
Contributions to U.K. pension plans
$1 $1 $3 $3 
Contributions to U.S. pension plans
23 13 67 31 
Contributions to other major pension plans2 2 10 9 
Total contributions$26 $16 $80 $43