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Trade and other receivables (Details 2) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables € 10,182 € 11,186
Other receivables 5,239 5,864
Not later than three months [member]    
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables 478 744
Other receivables 21 58
Later than three months and not later than six months [member]    
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables 46 49
Other receivables 9 81
Later than six months and not later than one year [member]    
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables 147 69
Other receivables 202 249
Later than one year [member]    
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables 144 322
Other receivables 372 175
Total Due [Member]    
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables 815 1,184
Other receivables 604 563
Trade receivables neither impaired nor past due [Member]    
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables 8,800 9,243
Other receivables 4,604 4,869
Impaired trade receivables [Member]    
DisclosureOfTradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables 567 759
Other receivables € 31 € 432