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18. Share capital and additional paid-in capital (Details Narrative)
Dec. 31, 2019
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 31,380,871 and 23,111,131 treasury shares as of December 31, 2019 and 2018, respectively.
[2] Relates to the Employee Stock Ownership Program Class C shares that have not been transferred.