The reconciliations of the actuarial benefits obligations, pension plan assets, and liabilities recognized in the statement of financial position as of December 31, 2017 and 2016 are presented as follows:
| Pensions | Other benefits | Total | ||||||||||||||||||||||||||
| 2017 | 2016 | 2017 | 2016 | 2017 | 2016 | |||||||||||||||||||||||
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Change in benefits obligation: |
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Projected benefit obligation at beginning of the period |
Ps | 51,055 | 42,740 | 1,164 | 1,100 | 52,219 | 43,840 | |||||||||||||||||||||
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Service cost |
221 | 151 | 33 | 25 | 254 | 176 | ||||||||||||||||||||||
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Interest cost |
1,625 | 1,685 | 76 | 59 | 1,701 | 1,744 | ||||||||||||||||||||||
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Actuarial (gains) losses |
727 | 6,263 | (24 | ) | 35 | 703 | 6,298 | |||||||||||||||||||||
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Additions through business combinations |
2,801 | — | 271 | — | 3,072 | — | ||||||||||||||||||||||
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Settlements and curtailments |
— | — | — | (19 | ) | — | (19 | ) | ||||||||||||||||||||
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Plan amendments |
15 | 8 | — | — | 15 | 8 | ||||||||||||||||||||||
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Benefits paid |
(2,920 | ) | (2,379 | ) | (81 | ) | (74 | ) | (3,001 | ) | (2,453 | ) | ||||||||||||||||
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Foreign currency translation |
1,386 | 2,587 | (3 | ) | 38 | 1,383 | 2,625 | |||||||||||||||||||||
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Projected benefit obligation at end of the period |
54,910 | 51,055 | 1,436 | 1,164 | 56,346 | 52,219 | ||||||||||||||||||||||
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Change in plan assets: |
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Fair value of plan assets at beginning of the period |
28,828 | 25,547 | 26 | 24 | 28,854 | 25,571 | ||||||||||||||||||||||
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Return on plan assets |
932 | 974 | 2 | 2 | 934 | 976 | ||||||||||||||||||||||
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Actuarial (gains) losses for the period |
707 | 2,278 | (1 | ) | 1 | 706 | 2,279 | |||||||||||||||||||||
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Employer contributions |
1,494 | 1,289 | 81 | 93 | 1,575 | 1,382 | ||||||||||||||||||||||
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Additions through business combinations |
2,841 | — | — | — | 2,841 | — | ||||||||||||||||||||||
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Reduction for disposal of assets |
(4 | ) | — | — | — | (4 | ) | — | ||||||||||||||||||||
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Settlements and curtailments |
— | — | — | (19 | ) | — | (19 | ) | ||||||||||||||||||||
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Benefits paid |
(2,920 | ) | (2,379 | ) | (81 | ) | (74 | ) | (3,001 | ) | (2,453 | ) | ||||||||||||||||
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Foreign currency translation |
787 | 1,119 | 1 | (1 | ) | 788 | 1,118 | |||||||||||||||||||||
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Fair value of plan assets at end of the period |
32,665 | 28,828 | 28 | 26 | 32,693 | 28,854 | ||||||||||||||||||||||
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Amounts recognized in the statements of financial position: |
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Net projected liability recognized in the statement of financial position |
Ps | 22,245 | 22,227 | 1,408 | 1,138 | 23,653 | 23,365 | |||||||||||||||||||||
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