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Share-based payments - Legacy programs - Stock Options (Details)
12 Months Ended
Dec. 31, 2019
Options
plan
€ / shares
shares
Dec. 31, 2018
Options
€ / shares
Dec. 31, 2017
Options
€ / shares
Dec. 31, 2016
Options
€ / shares
Stock Option        
Share-based payment        
Number of global plans | plan 1      
Number of shares per option | shares 1      
Balanced at beginning of period (in shares) | Options 23,000 447,500 1,601,021  
Shares exercised | Options (23,000) (424,500) (415,750)  
Shares forfeited | Options     (215,000)  
Shares expired | Options     (522,771)  
Balance at end of period (in shares) | Options   23,000 447,500  
Weighted average exercise price at beginning of period € 2.35 € 2.07 € 3.34  
Weighted average exercise price - exercised 2.35 2.06 2.13  
Weighted average exercise price - forfeited     2.71  
Weighted average exercise price - expired     5.65  
Weighted average exercise price at end of period   2.35 2.07  
Weighted average share price € 5.34 € 5.07 € 4.93  
Number of options exercisable | Options   23,000 447,500 1,197,771
Weighted average exercise price of exercisable options   € 2.35 € 2.07 € 3.56
Performance Share Plan of 2015 | Alcatel Lucent        
Share-based payment        
Number of shares issued | shares 1,314,468