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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
U.K.
U.S.
Other
 202420232024202320242023
Service cost$— $— $— $— $— $— 
Interest cost35 36 23 26 9 10 
Expected return on plan assets, net of administration expenses(47)(46)(33)(30)(13)(12)
Amortization of prior-service cost1 — — — — — 
Amortization of net actuarial loss20 18 7 9 3 3 
Net periodic (benefit) cost9 8 (3)5 (1)1 
Loss on pension settlement— — — — — — 
Total net periodic (benefit) cost$9 $8 $(3)$5 $(1)$1 
Schedule of Employer's Contributions The following table summarizes contributions made to the Company’s significant pension plans (in millions):
Three Months Ended March 31,
20242023
Contributions to U.K. pension plans
$1 $1 
Contributions to U.S. pension plans
14 16 
Contributions to other major pension plans2 6 
Total contributions$17 $23