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Property, plant and equipment (Details 2)
 12 Months Ended
Dec. 31, 2017
Buildings [Member] | Bottom Of Range [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 2%
Buildings [Member] | Top Of Range [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 10%
Mineral exploration wells and plants [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment UOP
Refining and chemical plants [Member] | Bottom Of Range [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 2%
Refining and chemical plants [Member] | Top Of Range [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 17%
Gas pipelines and compression stations [Member] | Bottom Of Range [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 2%
Gas pipelines and compression stations [Member] | Top Of Range [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 12%
Power plants [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 5%
Other Plant And Machinery [Member] | Bottom Of Range [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 6%
Other Plant And Machinery [Member] | Top Of Range [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 12%
Industrial and commercial equipment [Member] | Bottom Of Range [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 5%
Industrial and commercial equipment [Member] | Top Of Range [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 25%
Other Property Plant And Equipment [Member] | Bottom Of Range [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 10%
Other Property Plant And Equipment [Member] | Top Of Range [Member]  
DisclosureOfPropertyPlantAndEquipmentExplanatoryLineItems [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 20%