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Revenues - Summary of Breakdown of Revenues by Sales Channels (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of revenue [line items]      
Sales of goods and services $ 435,558 $ 243,230 $ 194,782
Gas Stations [member]      
Disclosure of revenue [line items]      
Sales of goods and services 168,665 104,077 86,936
Power plants [member]      
Disclosure of revenue [line items]      
Sales of goods and services 20,343 17,139 19,567
Distribution companies [member]      
Disclosure of revenue [line items]      
Sales of goods and services 14,180 3,313 1,244
Retail distribution of natural gas [member]      
Disclosure of revenue [line items]      
Sales of goods and services 25,420 11,071 7,488
Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Sales of goods and services 91,496 48,368 30,978
Agriculture [member]      
Disclosure of revenue [line items]      
Sales of goods and services 35,868 22,030 17,889
Petrochemical industry [member]      
Disclosure of revenue [line items]      
Sales of goods and services 19,590 10,334 7,881
Trading [member]      
Disclosure of revenue [line items]      
Sales of goods and services 18,342 7,703 6,963
Oil companies [member]      
Disclosure of revenue [line items]      
Sales of goods and services 12,760 4,207 4,529
Commercialization of liquefied petroleum gas [member]      
Disclosure of revenue [line items]      
Sales of goods and services 4,961 2,979 1,809
Other sales channels [member]      
Disclosure of revenue [line items]      
Sales of goods and services 23,933 12,009 9,498
Upstream [member]      
Disclosure of revenue [line items]      
Sales of goods and services 3,181 774 4,503
Upstream [member] | Power plants [member]      
Disclosure of revenue [line items]      
Sales of goods and services     1,684
Upstream [member] | Distribution companies [member]      
Disclosure of revenue [line items]      
Sales of goods and services     413
Upstream [member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Sales of goods and services     584
Upstream [member] | Trading [member]      
Disclosure of revenue [line items]      
Sales of goods and services     1,075
Upstream [member] | Commercialization of liquefied petroleum gas [member]      
Disclosure of revenue [line items]      
Sales of goods and services     162
Upstream [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Sales of goods and services 3,181 774 585
Downstream [member]      
Disclosure of revenue [line items]      
Sales of goods and services 336,569 195,235 160,914
Downstream [member] | Gas Stations [member]      
Disclosure of revenue [line items]      
Sales of goods and services 168,665 104,077 86,936
Downstream [member] | Power plants [member]      
Disclosure of revenue [line items]      
Sales of goods and services 260 4,067 9,567
Downstream [member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Sales of goods and services 71,746 36,810 24,518
Downstream [member] | Agriculture [member]      
Disclosure of revenue [line items]      
Sales of goods and services 35,868 22,030 17,889
Downstream [member] | Petrochemical industry [member]      
Disclosure of revenue [line items]      
Sales of goods and services 19,590 10,334 7,881
Downstream [member] | Trading [member]      
Disclosure of revenue [line items]      
Sales of goods and services 18,342 7,703 5,888
Downstream [member] | Oil companies [member]      
Disclosure of revenue [line items]      
Sales of goods and services 12,760 4,207 4,529
Downstream [member] | Commercialization of liquefied petroleum gas [member]      
Disclosure of revenue [line items]      
Sales of goods and services 4,961 2,979 1,647
Downstream [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Sales of goods and services 4,377 3,028 2,059
Gas and energy [member]      
Disclosure of revenue [line items]      
Sales of goods and services 86,883 44,408 26,801
Gas and energy [member] | Power plants [member]      
Disclosure of revenue [line items]      
Sales of goods and services 20,083 13,072 8,316
Gas and energy [member] | Distribution companies [member]      
Disclosure of revenue [line items]      
Sales of goods and services 14,180 3,313 831
Gas and energy [member] | Retail distribution of natural gas [member]      
Disclosure of revenue [line items]      
Sales of goods and services 25,420 11,071 7,488
Gas and energy [member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Sales of goods and services 19,750 11,558 5,876
Gas and energy [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Sales of goods and services 7,450 5,394 4,290
Corporation and others [member]      
Disclosure of revenue [line items]      
Sales of goods and services 8,925 2,813 2,564
Corporation and others [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Sales of goods and services $ 8,925 $ 2,813 $ 2,564