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Revenues - Summary of Breakdown of Revenues by Sales Channels (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of revenue [line items]      
Sales of goods and services $ 682,928 $ 686,644 $ 435,558
Gas Stations [member]      
Disclosure of revenue [line items]      
Sales of goods and services 241,547 257,648 168,665
Power plants [member]      
Disclosure of revenue [line items]      
Sales of goods and services 28,011 16,414 20,343
Distribution companies [member]      
Disclosure of revenue [line items]      
Sales of goods and services 28,895 19,506 14,180
Retail distribution of natural gas [member]      
Disclosure of revenue [line items]      
Sales of goods and services 33,995 49,699 25,420
Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Sales of goods and services 116,741 144,333 91,496
Agriculture [member]      
Disclosure of revenue [line items]      
Sales of goods and services 92,677 64,344 35,868
Petrochemical industry [member]      
Disclosure of revenue [line items]      
Sales of goods and services 23,215 24,475 19,590
Trading [member]      
Disclosure of revenue [line items]      
Sales of goods and services 40,359 39,341 18,342
Oil companies [member]      
Disclosure of revenue [line items]      
Sales of goods and services 26,032 20,066 12,760
Commercialization of liquefied petroleum gas [member]      
Disclosure of revenue [line items]      
Sales of goods and services 6,544 6,087 4,961
Other sales channels [member]      
Disclosure of revenue [line items]      
Sales of goods and services 44,912 44,731 23,933
Upstream [member]      
Disclosure of revenue [line items]      
Sales of goods and services 2,472 2,087 3,181
Upstream [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Sales of goods and services 2,472 2,087 3,181
Downstream [member]      
Disclosure of revenue [line items]      
Sales of goods and services 546,173 537,791 336,569
Downstream [member] | Gas Stations [member]      
Disclosure of revenue [line items]      
Sales of goods and services 241,547 257,648 168,665
Downstream [member] | Power plants [member]      
Disclosure of revenue [line items]      
Sales of goods and services 14,600 709 260
Downstream [member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Sales of goods and services 87,757 116,742 71,746
Downstream [member] | Agriculture [member]      
Disclosure of revenue [line items]      
Sales of goods and services 92,677 64,344 35,868
Downstream [member] | Petrochemical industry [member]      
Disclosure of revenue [line items]      
Sales of goods and services 23,215 24,475 19,590
Downstream [member] | Trading [member]      
Disclosure of revenue [line items]      
Sales of goods and services 40,359 39,341 18,342
Downstream [member] | Oil companies [member]      
Disclosure of revenue [line items]      
Sales of goods and services 26,032 20,066 12,760
Downstream [member] | Commercialization of liquefied petroleum gas [member]      
Disclosure of revenue [line items]      
Sales of goods and services 6,544 6,087 4,961
Downstream [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Sales of goods and services 13,442 8,379 4,377
Gas and power [member]      
Disclosure of revenue [line items]      
Sales of goods and services 119,176 125,853 86,883
Gas and power [member] | Power plants [member]      
Disclosure of revenue [line items]      
Sales of goods and services 13,411 15,705 20,083
Gas and power [member] | Distribution companies [member]      
Disclosure of revenue [line items]      
Sales of goods and services 28,895 19,506 14,180
Gas and power [member] | Retail distribution of natural gas [member]      
Disclosure of revenue [line items]      
Sales of goods and services 33,995 49,699 25,420
Gas and power [member] | Industries, transport and aviation [member]      
Disclosure of revenue [line items]      
Sales of goods and services 28,984 27,591 19,750
Gas and power [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Sales of goods and services 13,891 13,352 7,450
Corporation and others [member]      
Disclosure of revenue [line items]      
Sales of goods and services 15,107 20,913 8,925
Corporation and others [member] | Other sales channels [member]      
Disclosure of revenue [line items]      
Sales of goods and services $ 15,107 $ 20,913 $ 8,925