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Intangible assets (Details 1) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Intangible Assets Explanatory [Line Items]    
Intangible exploration and evaluation assets € 1,081 € 995
Proved licence and leasehold property acquisition costs [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Intangible exploration and evaluation assets 357 403
Unproved licence and leasehold property acquisition costs [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Intangible exploration and evaluation assets 684 586
Other Mineral Interests [Member]    
Disclosure Of Intangible Assets Explanatory [Line Items]    
Intangible exploration and evaluation assets € 40 € 6