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Share-based payments - Performance shares (Details)
12 Months Ended
Dec. 31, 2019
EquityInstruments
ShareBasedCompensationPlan
multiplier
Jan. 01, 2019
EquityInstruments
Dec. 31, 2018
EquityInstruments
Dec. 31, 2017
EquityInstruments
Dec. 31, 2016
EquityInstruments
Performance Shares          
Share-based payment          
Number of performance share plans | ShareBasedCompensationPlan 4        
The factor of the maximum amount at target | multiplier 2        
Shares outstanding at target 91,225,523   83,143,531 60,516,243 43,417,550
Minimum restriction period from the end of the performance period 1 year        
Performance Share Plan of 2016          
Share-based payment          
Shares outstanding at target   25,706,652      
Confirmed payout as a percentage of target 46.00%        
Performance Share Plan of 2017          
Share-based payment          
Shares outstanding at target 25,706,652        
Confirmed payout as a percentage of target 29.00%        
Performance Share Plan 2018          
Share-based payment          
Shares outstanding at target 33,932,724        
Confirmed payout as a percentage of target 57.00%        
Performance Share Plan 2019          
Share-based payment          
Minimum percentage of the number of shares granted at target to be settled following the restriction period 25.00%        
Performance period 3 years        
Shares outstanding at target 31,586,147