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Property, plant and equipment (Details 1)
 12 Months Ended
Dec. 31, 2018
Buildings [member] | Bottom of range [member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 2
Buildings [member] | Top of range [member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 10
Mineral Exploration Wells And Plants [Member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment UOP
Refining And Chemical Plants [Member] | Bottom of range [member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 2
Refining And Chemical Plants [Member] | Top of range [member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 17
Gas Pipelines And Compression Stations [Member] | Bottom of range [member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 2
Gas Pipelines And Compression Stations [Member] | Top of range [member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 12
Power plants [Member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 5
Other Plant And Machinery [Member] | Bottom of range [member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 6
Other Plant And Machinery [Member] | Top of range [member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 12
Industrial And Commercial Equipment [Member] | Bottom of range [member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 5
Industrial And Commercial Equipment [Member] | Top of range [member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 25
Other assets [Member] | Bottom of range [member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 10
Other assets [Member] | Top of range [member]  
Disclosure Of Property Plant And Equipment Explanatory [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 20