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Employee Benefits (Tables) | 6 Months Ended
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Jun. 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 June 30,
| U.K. |  | U.S. |  | Other
| 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 21 |  |  | 17 |  |  | 17 |  |  | 14 |  |  | 4 |  |  | 3 |
Expected return on plan assets, net of administration expenses | (34) |  |  | (35) |  |  | (27) |  |  | (32) |  |  | (8) |  |  | (8) |
Amortization of prior-service cost | — |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | 8 |  |  | 8 |  |  | 17 |  |  | 20 |  |  | 3 |  |  | 3 |
Net periodic (benefits) cost | (5) |  |  | (9) |  |  | 7 |  |  | 2 |  |  | (1) |  |  | (2) |
Loss on pension settlement | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total net periodic (benefit) cost | $ | (5) |  |  | $ | (9) |  |  | $ | 7 |  |  | $ | 2 |  |  | $ | (1) |  |  | $ | (2) |
| Six Months Ended June 30,
| U.K. |  | U.S. |  | Other
| 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 44 |  |  | 33 |  |  | 34 |  |  | 28 |  |  | 9 |  |  | 6 |
Expected return on plan assets, net of administration expenses | (70) |  |  | (69) |  |  | (54) |  |  | (64) |  |  | (17) |  |  | (16) |
Amortization of prior-service cost | 1 |  |  | 2 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss | 15 |  |  | 16 |  |  | 33 |  |  | 39 |  |  | 7 |  |  | 7 |
Net periodic (benefits) cost | (10) |  |  | (18) |  |  | 13 |  |  | 3 |  |  | (1) |  |  | (3) |
Loss on pension settlement | — |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |
Total net periodic (benefit) cost | $ | (10) |  |  | $ | (18) |  |  | $ | 14 |  |  | $ | 3 |  |  | $ | (1) |  |  | $ | (3) |
Schedule of Employer's Contributions | 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,
| 2022 |  | 2021 |  | 2022 |  | 2021
Contributions to U.K. pension plans | $ | 2 |  |  | $ | 2 |  |  | $ | 5 |  |  | $ | 6 |
Contributions to U.S. pension plans | 7 |  |  | 8 |  |  | 25 |  |  | 46 |
Contributions to other major pension plans | 2 |  |  | 2 |  |  | 10 |  |  | 10 |
Total contributions | $ | 11 |  |  | $ | 12 |  |  | $ | 40 |  |  | $ | 62 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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