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Share-based payment - Performance shares (Details)
€ / shares in Units, € in Millions
12 Months Ended
Dec. 31, 2017
EUR (€)
EquityInstruments
ShareBasedCompensationPlan
multiplier
€ / shares
Dec. 31, 2016
EquityInstruments
Dec. 31, 2015
EquityInstruments
Dec. 31, 2014
EquityInstruments
Performance Shares        
Share-based payment        
Number of performance share plans | ShareBasedCompensationPlan 4      
Shares outstanding at target 60,516,243 43,417,550 22,928,850 17,234,066
Minimum restriction period from the end of the performance period 1 year      
Performance Share Plan of 2014        
Share-based payment        
Confirmed payout as a percentage of target 126.00%      
Performance Share Plan of 2015        
Share-based payment        
Shares outstanding at target 10,167,021      
Confirmed payout as a percentage of target 124.00%      
Performance Share Plan of 2016        
Share-based payment        
Shares outstanding at target 20,717,300      
Confirmed payout as a percentage of target 46.00%      
Performance Share Plan of 2017        
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      
The factor of the maximum amount at target | multiplier 2      
Shares outstanding at target 29,631,922      
Average annual net sales weight (as a percent) 50.00%      
Average annual diluted EPS weight (as a percent) 50.00%      
Minimum | Performance Share Plan of 2017        
Share-based payment        
Average annual net sales | € € 22,842      
Average annual diluted EPS | € / shares € 0.26      
Maximum | Performance Share Plan of 2017        
Share-based payment        
Average annual net sales | € € 26,280      
Average annual diluted EPS | € / shares € 0.38