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Investments in Joint Operations - Information of Assets and Liabilities (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of joint operations [line items]      
Noncurrent assets $ 1,595,656 $ 1,263,868 $ 785,601
Current assets 327,569 309,421 208,415
Total assets 1,923,225 1,573,289 994,016
Noncurrent liabilities 869,161 710,318 452,690
Current liabilities 370,669 314,872 178,969
Total liabilities 1,239,830 1,025,190 631,659
Exploration expenses 5,846 6,841 5,466
Joint Ventures [member]      
Disclosure of joint operations [line items]      
Noncurrent assets 282,381 221,219 130,272
Current assets 6,122 8,723 4,024
Total assets 288,503 229,942 134,296
Noncurrent liabilities 21,136 17,754 11,484
Current liabilities 21,574 27,641 9,695
Total liabilities 42,710 45,395 21,179
Production cost 87,322 70,552 39,713
Exploration expenses $ 265 $ 123 $ 242