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Employee Benefits (Tables)
 6 Months Ended
Jun. 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 June 30,
 
U.K.
U.S.
Other
 202520242025202420252024
Service cost$— $— $— $— $— $— 
Interest cost39 36 25 23 10 10 
Expected return on plan assets, net of administration expenses(45)(47)(30)(35)(14)(14)
Amortization of prior-service cost— — — — — — 
Amortization of net actuarial loss22 21 9 8 4 3 
Net periodic cost (benefit) $16 $10 $4 $(4)$— $(1)
 Six Months Ended June 30,
 
U.K.
U.S.
Other
 202520242025202420252024
Service cost$— $— $— $— $— $— 
Interest cost76 71 51 46 19 19 
Expected return on plan assets, net of administration expenses(88)(94)(60)(68)(26)(27)
Amortization of prior-service cost1 1 — — — — 
Amortization of net actuarial loss44 41 18 15 7 6 
Net periodic (benefit) cost$33 $19 $9 $(7)$— $(2)
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,
2025202420252024
Contributions to U.K. pension plans
$1 $1 $2 $2 
Contributions to U.S. pension plans
17 4 44 18 
Contributions to other major pension plans6 5 8 7 
Total contributions$24 $10 $54 $27