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v3.25.3

Employee Benefits | 9 Months Ended
--- | ---
Sep. 30, 2025
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 September 30,
| U.K. |  | U.S. |  | Other
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 38 |  |  | 37 |  |  | 26 |  |  | 23 |  |  | 10 |  |  | 10 |
Expected return on plan assets, net of administration expenses | (46) |  |  | (48) |  |  | (30) |  |  | (33) |  |  | (13) |  |  | (14) |
Amortization of prior-service cost | 1 |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | 23 |  |  | 21 |  |  | 8 |  |  | 7 |  |  | 4 |  |  | 4 |
Net periodic cost (benefit) | $ | 16 |  |  | $ | 11 |  |  | $ | 4 |  |  | $ | (3) |  |  | $ | 1 |  |  | $ | — |
| Nine Months Ended September 30,
| U.K. |  | U.S. |  | Other
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 114 |  |  | 108 |  |  | 77 |  |  | 69 |  |  | 29 |  |  | 29 |
Expected return on plan assets, net of administration expenses | (134) |  |  | (142) |  |  | (90) |  |  | (101) |  |  | (39) |  |  | (41) |
Amortization of prior-service cost | 2 |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | 67 |  |  | 62 |  |  | 26 |  |  | 22 |  |  | 11 |  |  | 10 |
Net periodic (benefit) cost | $ | 49 |  |  | $ | 30 |  |  | $ | 13 |  |  | $ | (10) |  |  | $ | 1 |  |  | $ | (2) |
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, $76 million, and $10 million (at December 31, 2024 exchange rates) to its significant U.K., U.S., and other major pension plans, respectively, during 2025. 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,
| 2025 |  | 2024 |  | 2025 |  | 2024
Contributions to U.K. pension plans | $ | 1 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 3 |
Contributions to U.S. pension plans | 23 |  |  | 13 |  |  | 67 |  |  | 31 |
Contributions to other major pension plans | 2 |  |  | 2 |  |  | 10 |  |  | 9 |
Total contributions | $ | 26 |  |  | $ | 16 |  |  | $ | 80 |  |  | $ | 43 |

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