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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2024
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
 202420232024202320242023
Service cost$— $— $— $— $— $— 
Interest cost37 38 23 26 10 10 
Expected return on plan assets, net of administration expenses(48)(49)(33)(29)(14)(12)
Amortization of prior-service cost1 1 — — — — 
Amortization of net actuarial loss21 19 7 8 4 3 
Net periodic (benefit) cost11 9 (3)5 — 1 
Loss on pension settlement— — — — — — 
Total net periodic (benefit) cost$11 $9 $(3)$5 $— $1 
 Nine Months Ended September 30,
 
U.K.
U.S.
Other
 202420232024202320242023
Service cost$— $— $— $— $— $— 
Interest cost108 110 69 78 29 30 
Expected return on plan assets, net of administration expenses(142)(143)(101)(89)(41)(36)
Amortization of prior-service cost2 2 — — — — 
Amortization of net actuarial loss62 56 22 25 10 10 
Net periodic (benefit) cost30 25 (10)14 (2)4 
Loss on pension settlement— — — — — 27 
Total net periodic (benefit) cost$30 $25 $(10)$14 $(2)31 
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,
2024202320242023
Contributions to U.K. pension plans
$1 $1 $3 $3 
Contributions to U.S. pension plans
13 6 31 27 
Contributions to other major pension plans2 2 9 10 
Total contributions$16 $9 $43 $40