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Employee Benefits | 6 Months Ended
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Jun. 30, 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 June 30,
| U.K. |  | U.S. |  | Other
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 4 |
Interest cost | 58 |  |  | 51 |  |  | 32 |  |  | 28 |  |  | 12 |  |  | 11 |
Expected return on plan assets | (83 | ) |  | (74 | ) |  | (39 | ) |  | (35 | ) |  | (15 | ) |  | (14 | )
Amortization of net actuarial loss | 14 |  |  | 12 |  |  | 11 |  |  | 13 |  |  | 2 |  |  | 7 |
Total net periodic (benefit) cost | $ | (11 | ) |  | $ | (11 | ) |  | $ | 4 |  |  | $ | 6 |  |  | $ | (1 | ) |  | $ | 8 |
| Six months ended June 30,
| U.K. |  | U.S. |  | Other
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 9 |
Interest cost | 116 |  |  | 104 |  |  | 64 |  |  | 56 |  |  | 24 |  |  | 22 |
Expected return on plan assets | (165 | ) |  | (149 | ) |  | (78 | ) |  | (69 | ) |  | (30 | ) |  | (29 | )
Amortization of net actuarial loss | 27 |  |  | 24 |  |  | 21 |  |  | 26 |  |  | 4 |  |  | 13 |
Net periodic (benefit) cost | (22 | ) |  | (21 | ) |  | 7 |  |  | 13 |  |  | (2 | ) |  | 15 |
Curtailment loss (gain) and other | — |  |  | — |  |  | 1 |  |  | — |  |  | (3 | ) |  | — |
Total net periodic (benefit) cost | $ | (22 | ) |  | $ | (21 | ) |  | $ | 8 |  |  | $ | 13 |  |  | $ | (5 | ) |  | $ | 15 |
Based on current assumptions, in 2014, Aon plans to contribute $183 million, $173 million, and $29 million to its U.K., U.S. and other significant international pension plans, respectively. During the three months ended June 30, 2014, contributions of $56 million, $33 million, and $4 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively. During the six months ended June 30, 2014, contributions of $121 million, $73 million, and $16 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively. During the three months ended June 30, 2013, contributions of $57 million, $35 million, and $7 million were made to the Company's U.K., U.S. and other significant international pension plans, respectively. During the six months ended June 30, 2013, contributions of $187 million, $68 million, and $44 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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