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Basis of Preparation of the Consolidated Financial Statements - Detailed Information About Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2020
Buildings and other constructions [Member]
Disclosure of estimated useful life of the Property, plant and equipment [line items]
Estimated useful life of the assets	50
Furniture, fixtures and installations [member]
Disclosure of estimated useful life of the Property, plant and equipment [line items]
Estimated useful life of the assets	10
Selling equipment [member]
Disclosure of estimated useful life of the Property, plant and equipment [line items]
Estimated useful life of the assets	10
Other Property [member]
Disclosure of estimated useful life of the Property, plant and equipment [line items]
Estimated useful life of the assets	10
Bottom of range [member] \| Refinery equipment and petrochemical plants [member]
Disclosure of estimated useful life of the Property, plant and equipment [line items]
Estimated useful life of the assets	20
Bottom of range [member] \| Infrastructure for Natural Gas Distribution [member]
Disclosure of estimated useful life of the Property, plant and equipment [line items]
Estimated useful life of the assets	20
Bottom of range [member] \| Transportation equipment [member]
Disclosure of estimated useful life of the Property, plant and equipment [line items]
Estimated useful life of the assets	5
Top of range [member] \| Refinery equipment and petrochemical plants [member]
Disclosure of estimated useful life of the Property, plant and equipment [line items]
Estimated useful life of the assets	25
Top of range [member] \| Infrastructure for Natural Gas Distribution [member]
Disclosure of estimated useful life of the Property, plant and equipment [line items]
Estimated useful life of the assets	50
Top of range [member] \| Transportation equipment [member]
Disclosure of estimated useful life of the Property, plant and equipment [line items]
Estimated useful life of the assets	25