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Employee Benefits | 6 Months Ended
--- | ---
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Employee Benefits | Employee Benefits The following table provides the components of the net periodic (benefit) cost recognized in the Condensed Consolidated Statements of Income in Compensation and benefits for Aon's material U.K., U.S., and other significant international pension plans located in the Netherlands and Canada (in millions):
| Three months ended June 30,
| U.K. |  | U.S. |  | Other
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 50 |  |  | 58 |  |  | 33 |  |  | 32 |  |  | 9 |  |  | 12 |
Expected return on plan assets | (77 | ) |  | (83 | ) |  | (38 | ) |  | (39 | ) |  | (13 | ) |  | (15 | )
Amortization of net actuarial loss | 10 |  |  | 14 |  |  | 13 |  |  | 11 |  |  | 3 |  |  | 2 |
Net periodic (benefit) cost | (17 | ) |  | (11 | ) |  | 9 |  |  | 4 |  |  | (1 | ) |  | (1 | )
Curtailment loss (gain) and other | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total net periodic (benefit) cost | $ | (17 | ) |  | $ | (11 | ) |  | $ | 9 |  |  | $ | 4 |  |  | $ | (1 | ) |  | $ | (1 | )
| Six months ended June 30,
| U.K. |  | U.S. |  | Other
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | — |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 99 |  |  | 116 |  |  | 66 |  |  | 64 |  |  | 17 |  |  | 24 |
Expected return on plan assets | (152 | ) |  | (165 | ) |  | (77 | ) |  | (78 | ) |  | (25 | ) |  | (30 | )
Amortization of net actuarial loss | 20 |  |  | 27 |  |  | 27 |  |  | 21 |  |  | 6 |  |  | 4 |
Net periodic (benefit) cost | (33 | ) |  | (22 | ) |  | 18 |  |  | 7 |  |  | (2 | ) |  | (2 | )
Curtailment loss (gain) and other | — |  |  | — |  |  | (1 | ) |  | 1 |  |  | — |  |  | (3 | )
Total net periodic (benefit) cost | $ | (33 | ) |  | $ | (22 | ) |  | $ | 17 |  |  | $ | 8 |  |  | $ | (2 | ) |  | $ | (5 | )
Based on current assumptions, in 2015, the Company expects to contribute approximately $65 million, $132 million, and $23 million to its U.K., U.S. and other significant international pension plans, respectively. During the three months ended June 30, 2015, contributions of $15 million, $28 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, 2015, contributions of $34 million, $62 million, and $8 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, 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.

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