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Trade and other receivables (Details 4)
€ in Millions
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
EUR (€)
Disclosure Of Trade And Other Receivables [Line Items]      
Reversal, allowance account for credit losses of financial assets € (120)    
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets 498    
Carrying amount, End of period 3,150    
Changes in accounting policies (IFRS 9) 294    
Performing receivables [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Reversal, allowance account for credit losses of financial assets (189)    
Defaulted receivables [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Reversal, allowance account for credit losses of financial assets (532)    
Carrying amount, End of period 2,237    
Trade receivables [member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Carrying amount, Beginning of period 2,639 $ 2,639  
Other changes 307    
Carrying amount, End of period 3,150   € 2,639
Trade receivables [member] | Performing receivables [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Net Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets 126    
Trade receivables [member] | Defaulted receivables [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Net Additional Allowance Recognised In Profit Or Loss Allowance Account For Credit Losses Of Financial Assets € 372    
Trade receivables [member] | Previously stated [member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Carrying amount, Beginning of period     2,303
Additional allowance recognised in profit or loss, allowance account for credit losses of financial assets     927
Deductions     (454)
Other changes     € (137)
Trade receivables [member] | Increase Decrease Due To Application Of IFRS 9 [Member]      
Disclosure Of Trade And Other Receivables [Line Items]      
Changes in accounting policies (IFRS 9) | $   $ 427