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Shareholders' equity and dividends - share buyback and treasury shares (Details)
12 Months Ended
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Employees share saving plan [Member]    
Share saving plan at 1 January 10,352,671 11,243,234
Purchase 3,403,469 2,740,657
Allocated to employees (3,681,428) (3,631,220)
Share saving plan at 31 December 10,074,712 10,352,671
Share buyback programme [Member]    
Share buy-back programme at 1 January 0  
Purchase 23,578,410  
Cancellation 0  
Share buy-back programme at 31 December 23,578,410 0