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Other non-current assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfOtherNoncurrentLiabilitiesExplanatoryLineItems [Line Items]    
Tax receivables from_non-current € 507 € 502
Other receivables_related to divestments 118 222
Other receivables_Other non-current 44 52
Other receivables_non-current 162 274
Non-current derivative financial assets 80 108
Other non-current assets, other assets 574 464
Other non-current assets 1,323 1,348
Italian tax authorities [Member]    
DisclosureOfOtherNoncurrentLiabilitiesExplanatoryLineItems [Line Items]    
Non-current_Income tax 62 73
Non-current_Interest on tax credits 64 64
Non-current tax receivables from Italian tax authorities 126 137
Non-Italian tax authorities [Member]    
DisclosureOfOtherNoncurrentLiabilitiesExplanatoryLineItems [Line Items]    
Non-current tax receivables from non-Italian tax authorities € 381 € 365