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Acquisitions - Intangibles acquired (Details) - Alcatel Lucent - EUR (€)
€ in Millions
12 Months Ended 24 Months Ended
Jan. 04, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2016
Business combinations        
Intangible assets € 5,711      
Acquisition related costs   € 93   € 125
Revenue since acquisition date     € 12,151  
Net loss since acquisition date     € (508)  
Customer relationships        
Business combinations        
Intangible assets € 2,902      
Intangible assets, useful lives 10 years      
Technologies        
Business combinations        
Intangible assets € 2,170      
Intangible assets, useful lives 4 years      
Other intangible assets        
Business combinations        
Intangible assets € 639      
Intangible assets, useful lives 8 years