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Intangible assets (Details 2)
 12 Months Ended
Dec. 31, 2018
Exploration rights [member]  
Disclosure Of Intangible Assets Explanatory [Line Items]  
Useful lives or amortisation rates, intangible assets other than goodwill UOP - 33
Transport rights of natural gas [Member]  
Disclosure Of Intangible Assets Explanatory [Line Items]  
Useful lives or amortisation rates, intangible assets other than goodwill 3
Other concessions, licenses, trademarks and similar items [Member] | Bottom of range [member]  
Disclosure Of Intangible Assets Explanatory [Line Items]  
Useful lives or amortisation rates, intangible assets other than goodwill 3
Other concessions, licenses, trademarks and similar items [Member] | Top of range [member]  
Disclosure Of Intangible Assets Explanatory [Line Items]  
Useful lives or amortisation rates, intangible assets other than goodwill 33
Service concession arrangements [Member] | Bottom of range [member]  
Disclosure Of Intangible Assets Explanatory [Line Items]  
Useful lives or amortisation rates, intangible assets other than goodwill 20
Service concession arrangements [Member] | Top of range [member]  
Disclosure Of Intangible Assets Explanatory [Line Items]  
Useful lives or amortisation rates, intangible assets other than goodwill 33
Capitalized costs for customer acquisition [Member] | Bottom of range [member]  
Disclosure Of Intangible Assets Explanatory [Line Items]  
Useful lives or amortisation rates, intangible assets other than goodwill 25
Capitalized costs for customer acquisition [Member] | Top of range [member]  
Disclosure Of Intangible Assets Explanatory [Line Items]  
Useful lives or amortisation rates, intangible assets other than goodwill 33
Other intangible assets [Member] | Bottom of range [member]  
Disclosure Of Intangible Assets Explanatory [Line Items]  
Useful lives or amortisation rates, intangible assets other than goodwill 4
Other intangible assets [Member] | Top of range [member]  
Disclosure Of Intangible Assets Explanatory [Line Items]  
Useful lives or amortisation rates, intangible assets other than goodwill 20