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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2022
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
 202220212022202120222021
Service cost$— $— $— $— $— $— 
Interest cost20 16 17 15 5 3 
Expected return on plan assets, net of administration expenses(32)(34)(27)(33)(8)(8)
Amortization of prior-service cost1 1 — — — — 
Amortization of net actuarial loss7 8 17 19 3 4 
Net periodic (benefits) cost(4)(9)7 1 — (1)
Loss on pension settlement— — — — — — 
Total net periodic (benefit) cost$(4)$(9)$7 $1 $— $(1)
 Nine Months Ended September 30,
 U.K.U.S.Other
 202220212022202120222021
Service cost$— $— $— $— $— $— 
Interest cost64 49 51 43 14 9 
Expected return on plan assets, net of administration expenses(102)(103)(81)(97)(25)(24)
Amortization of prior-service cost2 3 — — — — 
Amortization of net actuarial loss22 24 50 58 10 11 
Net periodic (benefits) cost(14)(27)20 4 (1)(4)
Loss on pension settlement— — 1 — — — 
Total net periodic (benefit) cost$(14)$(27)$21 $4 $(1)$(4)
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,
2022202120222021
Contributions to U.K. pension plans$1 $2 $6 $8 
Contributions to U.S. pension plans7 8 32 54 
Contributions to other major pension plans2 2 12 12 
Total contributions$10 $12 $50 $74