XML 154 R131.htm IDEA: XBRL DOCUMENT v3.19.1
Share-based payment - Performance shares (Details)
12 Months Ended
Dec. 31, 2018
EquityInstruments
ShareBasedCompensationPlan
multiplier
Jan. 01, 2019
EquityInstruments
Dec. 31, 2017
EquityInstruments
Dec. 31, 2016
EquityInstruments
Dec. 31, 2015
EquityInstruments
Performance Shares          
Share-based payment          
Number of performance share plans | ShareBasedCompensationPlan 4        
Performance period 2 years        
The factor of the maximum amount at target | multiplier 2        
Shares outstanding at target 83,143,531   60,516,243 43,417,550 22,928,850
Minimum restriction period from the end of the performance period 1 year        
Performance Share Plan of 2015          
Share-based payment          
Confirmed payout as a percentage of target 124.00%        
Performance Share Plan of 2016          
Share-based payment          
Shares outstanding at target 18,969,595 18,969,595      
Confirmed payout as a percentage of target 46.00%        
Performance Share Plan of 2017          
Share-based payment          
Shares outstanding at target 27,696,747        
Confirmed payout as a percentage of target 29.00%        
Performance Share Plan 2018          
Share-based payment          
Minimum percentage of the number of shares granted at target to be settled following the restriction period 25.00%        
Performance period 2 years        
Shares outstanding at target 36,477,189        
Minimum restriction period from the end of the performance period 1 year