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Employee Benefits | 3 Months Ended
--- | ---
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract] |
Employee Benefits | Employee Benefits 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 March 31,
| U.K. |  | U.S. |  | Other
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 5 |
Interest cost | 58 |  |  | 53 |  |  | 32 |  |  | 28 |  |  | 12 |  |  | 11 |
Expected return on plan assets | (82 | ) |  | (75 | ) |  | (39 | ) |  | (34 | ) |  | (15 | ) |  | (15 | )
Amortization of net actuarial loss | 13 |  |  | 12 |  |  | 10 |  |  | 13 |  |  | 2 |  |  | 6 |
Net periodic (benefit) cost | (11 | ) |  | (10 | ) |  | 3 |  |  | 7 |  |  | (1 | ) |  | 7 |
Curtailment loss (gain) and other | — |  |  | — |  |  | 1 |  |  | — |  |  | (3 | ) |  | — |
Total net periodic benefit cost | $ | (11 | ) |  | $ | (10 | ) |  | $ | 4 |  |  | $ | 7 |  |  | $ | (4 | ) |  | $ | 7 |
Based on current assumptions, in 2014, Aon plans to contribute $185 million, $173 million, and $27 million to its U.K., U.S., and other significant international pension plans, respectively. During the three months ended March 31, 2014, contributions of $65 million, $40 million, and $12 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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