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Employee Benefits
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Employee Benefits Employee Benefits
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
 202420232024202320242023
Service cost$— $— $— $— $— $— 
Interest cost36 36 23 26 10 10 
Expected return on plan assets, net of administration expenses(47)(48)(35)(30)(14)(12)
Amortization of prior-service cost— 1 — — — — 
Amortization of net actuarial loss21 19 8 8 3 4 
Net periodic (benefit) cost10 8 (4)4 (1)2 
Loss on pension settlement— — — — — 27 
Total net periodic (benefit) cost$10 $8 $(4)$4 $(1)$29 
 Six Months Ended June 30,
 
U.K.
U.S.
Other
 202420232024202320242023
Service cost$— $— $— $— $— $— 
Interest cost71 72 46 52 19 20 
Expected return on plan assets, net of administration expenses(94)(94)(68)(60)(27)(24)
Amortization of prior-service cost1 1 — — — — 
Amortization of net actuarial loss41 37 15 17 6 7 
Net periodic (benefit) cost19 16 (7)9 (2)3 
Loss on pension settlement— — — — — 27 
Total net periodic (benefit) cost$19 $16 $(7)$9 $(2)30 
In May 2023, to further its pension de-risking strategy, the Company settled certain pension obligations in the Netherlands through the purchase of annuities, where certain pension assets were liquidated to purchase the annuities. A non-cash settlement charge totaling $27 million was recognized in the second quarter of 2023.
Contributions
Assuming no additional contributions are agreed to with, or required by, the pension plan trustees, the Company expects to make total cash contributions of approximately $2 million, $53 million, and $13 million (at December 31, 2023 exchange rates) to its significant U.K., U.S., and other major pension plans, respectively, during 2024. 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,
2024202320242023
Contributions to U.K. pension plans
$1 $1 $2 $2 
Contributions to U.S. pension plans
4 5 18 21 
Contributions to other major pension plans5 2 7 8 
Total contributions$10 $8 $27 $31