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Segment information - Reconcile (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment information      
Operating (loss)/profit € 16 € (1,100) € 1,697
Restructuring and associated charges (568) (759) (120)
Segment total      
Segment information      
Operating (loss)/profit 2,587 2,172 1,958
Unallocated items      
Segment information      
Operating (loss)/profit (2,571) (3,272) (261)
Amortization and depreciation of acquired intangible assets and property, plant and equipment (1,033) (1,026) (79)
Restructuring and associated charges (579) (774) (123)
Product portfolio strategy costs (536) (348)  
Transaction and related costs, including integration costs relating to the acquisition of Alcatel Lucent (206) (295) (99)
Impairment of intangible assets (173)    
Release of acquisition-related fair value adjustments to deferred revenue and inventory (55) (840)  
Other € 11 € 11 € 40