As of December 31, 2017 and 2016, the amounts and types of plan assets are as follows:
| December 31, | ||||||||
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Plan Assets |
2017 | 2016 | ||||||
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Cash and cash equivalents |
Ps. | 135,757 | Ps. | 5,906,660 | ||||
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Equity instruments |
1,034,178 | 2,694,291 | ||||||
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Debt instruments |
7,315,757 | 888,715 | ||||||
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Total plan assets |
Ps. | 8,485,692 | Ps. | 9,489,666 | ||||
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| December 31, | ||||||||
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Changes in Defined Benefit Obligations (DBO) |
2017 | 2016 | ||||||
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Defined benefit obligations at the beginning of the year |
Ps. | 1,212,114,331 | Ps. | 1,263,708,928 | ||||
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Service costs |
19,762,661 | 23,107,851 | ||||||
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Financing costs |
96,331,015 | 91,270,383 | ||||||
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Past service costs |
(33,244 | ) | ||||||
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Payments by the fund |
(59,417,940 | ) | (56,778,359 | ) | ||||
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Amount of (gains) and losses recognized through other comprehensive income: |
(12,594,541 | ) | (108,589,515 | ) | ||||
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Modifications to the pension plan |
(6,609,657 | ) | (571,713 | ) | ||||
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Remeasurements |
(1,471 | ) | — | |||||
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Reductions |
(26,399 | ) | — | |||||
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Defined benefit obligations at the end of year |
Ps. | 1,249,557,999 | Ps. | 1,212,114,331 | ||||
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