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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, 2017
Buildings and other constructions [Member]  
Disclosure of assets and liabilities with significant risk of material adjustment [line items]  
Estimated useful life of the assets 50 Years
Furniture Fixture and Installations [member]  
Disclosure of assets and liabilities with significant risk of material adjustment [line items]  
Estimated useful life of the assets 10 Years
Selling equipment [member]  
Disclosure of assets and liabilities with significant risk of material adjustment [line items]  
Estimated useful life of the assets 10 Years
Other Property [member]  
Disclosure of assets and liabilities with significant risk of material adjustment [line items]  
Estimated useful life of the assets 10 Years
Bottom of range [member] | Refinery equipment and petrochemical plants [member]  
Disclosure of assets and liabilities with significant risk of material adjustment [line items]  
Estimated useful life of the assets 20 Years
Bottom of range [member] | Infrastructure for Natural Gas Distribution [member]  
Disclosure of assets and liabilities with significant risk of material adjustment [line items]  
Estimated useful life of the assets 20 Years
Bottom of range [member] | Transportation equipment [member]  
Disclosure of assets and liabilities with significant risk of material adjustment [line items]  
Estimated useful life of the assets 5 Years
Bottom of range [member] | Electric Power Generation Facilities [member]  
Disclosure of assets and liabilities with significant risk of material adjustment [line items]  
Estimated useful life of the assets 15 Years
Top of range [member] | Refinery equipment and petrochemical plants [member]  
Disclosure of assets and liabilities with significant risk of material adjustment [line items]  
Estimated useful life of the assets 25 Years
Top of range [member] | Infrastructure for Natural Gas Distribution [member]  
Disclosure of assets and liabilities with significant risk of material adjustment [line items]  
Estimated useful life of the assets 50 Years
Top of range [member] | Transportation equipment [member]  
Disclosure of assets and liabilities with significant risk of material adjustment [line items]  
Estimated useful life of the assets 25 Years
Top of range [member] | Electric Power Generation Facilities [member]  
Disclosure of assets and liabilities with significant risk of material adjustment [line items]  
Estimated useful life of the assets 20 Years