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Employee Benefits | 3 Months Ended
--- | ---
Mar. 31, 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 March 31,
| U.K. |  | U.S. |  | Other
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 49 |  |  | 58 |  |  | 33 |  |  | 32 |  |  | 8 |  |  | 12 |
Expected return on plan assets | (75 | ) |  | (82 | ) |  | (39 | ) |  | (39 | ) |  | (12 | ) |  | (15 | )
Amortization of net actuarial loss | 10 |  |  | 13 |  |  | 14 |  |  | 10 |  |  | 3 |  |  | 2 |
Net periodic (benefit) cost | (16 | ) |  | (11 | ) |  | 9 |  |  | 3 |  |  | (1 | ) |  | (1 | )
Curtailment loss (gain) and other | — |  |  | — |  |  | (1 | ) |  | 1 |  |  | — |  |  | (3 | )
Total net periodic (benefit) cost | $ | (16 | ) |  | $ | (11 | ) |  | $ | 8 |  |  | $ | 4 |  |  | $ | (1 | ) |  | $ | (4 | )
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 March 31, 2015, contributions of $19 million, $34 million, and $4 million were made to the Company's 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 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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