Impairment test on Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of impairment of assets [Abstract]

Disclosure of detailed information about oil price scenarios [text block]

Table Oil price scenarios ^(a):

Amounts in US$ per Bbl.
							Weighted market price
							used for the
Year	Low price (15%)		Middle price (60%)		High price (25%)		impairment test
2018		64.9		64.9		64.9		64.9
2019		53.2		62.5		71.7		63.4
2020		54.4		63.9		73.4		64.9
Over 2021		54.3		63.7		73.2		64.7

^(a) The percentages indicated between brackets represent the Group estimation regarding each price scenario.