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Employee Benefits (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Components of net periodic benefit cost for the pension plans | The following table provides the components of the net periodic cost (benefit) recognized in the Condensed Consolidated Statements of Income for Aon’s material U.K., U.S., and other significant international pension plans 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
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 29 |  |  | 30 |  |  | 25 |  |  | 24 |  |  | 7 |  |  | 6 |
Expected return on plan assets, net of administration expenses | (50 | ) |  | (49 | ) |  | (36 | ) |  | (35 | ) |  | (11 | ) |  | (11 | )
Amortization of prior-service cost | — |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | — |
Amortization of net actuarial loss | 7 |  |  | 8 |  |  | 15 |  |  | 12 |  |  | 3 |  |  | 3 |
Net periodic cost (benefit) | (14 | ) |  | (11 | ) |  | 5 |  |  | 2 |  |  | (1 | ) |  | (2 | )
Loss on pension settlement | 16 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total net periodic cost (benefit) | $ | 2 |  |  | $ | (11 | ) |  | $ | 5 |  |  | $ | 2 |  |  | $ | (1 | ) |  | $ | (2 | )
| Six months ended June 30
| U.K. |  | U.S. |  | Other
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 58 |  |  | 60 |  |  | 50 |  |  | 48 |  |  | 14 |  |  | 12 |
Expected return on plan assets, net of administration expenses | (101 | ) |  | (97 | ) |  | (72 | ) |  | (70 | ) |  | (23 | ) |  | (22 | )
Amortization of prior-service cost | — |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | — |
Amortization of net actuarial loss | 15 |  |  | 15 |  |  | 30 |  |  | 25 |  |  | 6 |  |  | 6 |
Net periodic cost (benefit) | (28 | ) |  | (22 | ) |  | 9 |  |  | 4 |  |  | (3 | ) |  | (4 | )
Loss on pension settlement | 23 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total net periodic cost (benefit) | $ | (5 | ) |  | $ | (22 | ) |  | $ | 9 |  |  | $ | 4 |  |  | $ | (3 | ) |  | $ | (4 | )

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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 http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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