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17. Share capital and additional paid-in capital (Details Narrative) | Dec. 31, 2018 shares
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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.

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- Definition Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report. Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument. + References No definition available. + Details
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