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Equity (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share movements      
Total shares at the beginning 101,017,081,114 99,444,132,192  
Capitalization of retained earnings 1,819,784,762 1,572,948,922 1,819,784,762
Total shares at the end 101,017,081,114 99,444,132,192