As of December 31, 2017 and 2016, consolidated other non-current liabilities were as follows:
| 2017 | 2016 | |||||||||||
|
Asset retirement obligations1 |
Ps | 7,906 | 8,237 | |||||||||
|
Accruals for legal assessments and other responsibilities2 |
1,599 | 1,514 | ||||||||||
|
Non-current liabilities for valuation of derivative instruments |
402 | 818 | ||||||||||
|
Environmental liabilities3 |
991 | 1,172 | ||||||||||
|
Other non-current liabilities and provisions4 |
4,751 | 5,305 | ||||||||||
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| Ps | 15,649 | 17,046 | ||||||||||
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| 1 | Provisions for asset retirement include future estimated costs for demolition, cleaning and reforestation of production sites at the end of their operation, which are initially recognized against the related assets and are depreciated over their estimated useful life. |
| 2 | Provisions for legal claims and other responsibilities include items related to tax contingencies. |
| 3 | Environmental liabilities include future estimated costs arising from legal or constructive obligations, related to cleaning, reforestation and other remedial actions to remediate damage caused to the environment. The expected average period to settle these obligations is greater than 15 years. |
| 4 | As of December 31, 2017 and 2016, includes Ps1,498 and Ps2,300, respectively, of the non-current portion of taxes payable recognized in connection with the termination of the tax consolidation regime in Mexico as described in note 19.4. As of December 31, 2017 and 2016, Ps958 and Ps936, respectively, were included within current taxes payable. |