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18. PROVISION FOR ENVIRONMENTAL LIABILITIES AND ASSET RETIREMENT OBLIGATIONS (Tables) | 12 Months Ended
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Dec. 31, 2018
Provision For Environmental Liabilities And Asset Retirement Obligations Tables Abstract |
Provision for environmental liabilities and asset retirement obligation |
|  |  | Consolidated
| 12/31/2018 |  | 12/31/2017
Environmental liabilities | 198,386 |  | 255,517
Asset retirement obligations | 83,380 |  | 81,496
| 281,766 |  | 337,013

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