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Trade and other receivables (Details 3) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Trade And Other Receivables [Abstract]    
Receivables originated from divestments € 597 € 171
Accounts receivable from    
- joint venture partners in exploration and production 3,369 4,111
- prepayments for services 261 372
- insurance companies 157 147
- non-financial government entities 2 49
- factoring arrangements 28 81
- non-Italian oil entities for oil tax refunds 32 40
- other receivables 793 893
Other current receivables 4,642 5,693
Other receivables € 5,239 € 5,864