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Schedule of rollforward of outstanding shares (Details) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Equity      
Shares at the beginning of the year 807,707,162 811,759,800 811,416,022
Purchase of treasury shares (1,232,300) (4,836,000)
Delivery of restricted shares 944,830 783,362 343,778
Shares at the end of the year 807,419,692 807,707,162 811,759,800