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Employee Benefits (Tables) | 9 Months Ended
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Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract] |
Components of net periodic benefit cost for the pension plans | The following table provides the components of the net periodic benefit cost for Aon's material U.K., U.S., and other significant international pension plans, which are located in the Netherlands and Canada (in millions):
| Three months ended September 30,
| U.K. |  | U.S. |  | Other
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 5 |
Interest cost | 58 |  |  | 52 |  |  | 32 |  |  | 28 |  |  | 12 |  |  | 11 |
Expected return on plan assets | (82 | ) |  | (74 | ) |  | (39 | ) |  | (34 | ) |  | (15 | ) |  | (15 | )
Amortization of net actuarial loss | 13 |  |  | 12 |  |  | 11 |  |  | 13 |  |  | 2 |  |  | 6 |
Total net periodic (benefit) cost | $ | (11 | ) |  | $ | (10 | ) |  | $ | 4 |  |  | $ | 7 |  |  | $ | (1 | ) |  | $ | 7 |
| Nine months ended September 30,
| U.K. |  | U.S. |  | Other
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 14 |
Interest cost | 174 |  |  | 156 |  |  | 96 |  |  | 84 |  |  | 36 |  |  | 33 |
Expected return on plan assets | (247 | ) |  | (223 | ) |  | (117 | ) |  | (103 | ) |  | (45 | ) |  | (44 | )
Amortization of net actuarial loss | 40 |  |  | 36 |  |  | 32 |  |  | 39 |  |  | 6 |  |  | 19 |
Net periodic (benefit) cost | (33 | ) |  | (31 | ) |  | 11 |  |  | 20 |  |  | (3 | ) |  | 22 |
Curtailment loss (gain) and other | — |  |  | — |  |  | 1 |  |  | — |  |  | (3 | ) |  | — |
Total net periodic (benefit) cost | $ | (33 | ) |  | $ | (31 | ) |  | $ | 12 |  |  | $ | 20 |  |  | $ | (6 | ) |  | $ | 22 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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