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17. Share capital and additional paid-in capital (Details Narrative)
Dec. 31, 2018
shares
DisclosureOfShareCapitalAndAdditionalPaidinCapitalLineItems [Line Items]  
Entity Common Stock, Shares Outstanding 906,455,100
Class A Common Stock  
DisclosureOfShareCapitalAndAdditionalPaidinCapitalLineItems [Line Items]  
Entity Common Stock, Shares Outstanding 462,292,111
Class B Common Stock  
DisclosureOfShareCapitalAndAdditionalPaidinCapitalLineItems [Line Items]  
Entity Common Stock, Shares Outstanding 442,210,385 [1]
Class C Common Stock  
DisclosureOfShareCapitalAndAdditionalPaidinCapitalLineItems [Line Items]  
Entity Common Stock, Shares Outstanding 1,952,604 [2]
[1] Includes 23,385,028 and 7,794,168 treasury shares as of December 31, 2018 and 2017, respectively.
[2] Relates to the Employee Stock Ownership Program Class C shares that have not been transferred.