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Accrued expenses, deferred revenue and other liabilities - Subscript (Details) - EUR (€)
€ in Millions
1 Months Ended 12 Months Ended
Apr. 30, 2014
Dec. 31, 2017
Jul. 03, 2017
Dec. 31, 2016
Disclosure of Accounting Policies [Line Items]        
Non-current deferred revenue   € 2,204   € 1,171
Current deferred revenue   3,513   3,178
Financial liabilities   8,746   8,092
Microsoft agreement        
Disclosure of Accounting Policies [Line Items]        
Non-current deferred revenue   924   1,080
Current deferred revenue   € 155   € 155
Term of non-exclusive license to patents 10 years 10 years    
Nokia Shanghai Bell Co., Ltd        
Disclosure of Accounting Policies [Line Items]        
Financial liabilities   € 672 € 737