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Impairment/reversal of tangible and intangible assets (Details 2) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Reversals € 1,055 € 1,153
Tax effects (200) (346)
Reversals net of the relevant tax effects 855 807
Property Plant And Equipment [Member] | Exploration & Production [Member]    
Statement Line Items [Line Items]    
Reversals 776 1,055
Tax effects (171) (315)
Reversals net of the relevant tax effects 605 740
Property Plant And Equipment [Member] | Gas & Power [Member]    
Statement Line Items [Line Items]    
Reversals 202 86
Tax effects (5) (28)
Reversals net of the relevant tax effects 197 58
Property Plant And Equipment [Member] | Refining & Marketing and Chemical [Member]    
Statement Line Items [Line Items]    
Reversals 77 12
Tax effects (24) (3)
Reversals net of the relevant tax effects € 53 € 9