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Investment property
 12 Months Ended
Dec. 31, 2017
Investment property [abstract]  
Investment property
Investment property
 
Changes in the Group’s investment property in 2017 and 2016 were as follows:
 
 
2017
 
2016
Beginning of the year
2,666

 
4,796

Reclassification to property, plant and equipment (i)
—

 
(1,335
)
Exchange difference
(395
)
 
(795
)
End of the year
2,271

 
2,666

Cost
2,271

 
2,666

Accumulated depreciation
—

 
—

Net book amount
2,271

 
2,666

 
(i)       Relates to new contracts with third parties.
 
As of December 31, 2017, the fair value (level 3) of investment property was US$ 42 million (2016: US$ 45 million).