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Investment in Joint Operations - Information of Assets and Liabilities (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of joint operations [line items]      
Noncurrent assets $ 785,601 $ 383,420 $ 333,913
Current assets 208,415 122,298 87,226
Total assets 994,016 505,718 421,139
Noncurrent liabilities 452,690 250,451 220,012
Current liabilities 178,969 102,734 82,466
Total liabilities 631,659 353,185 302,478
Exploration expenses 5,466 2,456 3,155
Joint Ventures [member]      
Disclosure of joint operations [line items]      
Noncurrent assets 130,272 66,887 63,145
Current assets 4,024 2,417 2,602
Total assets 134,296 69,304 65,747
Noncurrent liabilities 11,484 5,876 5,946
Current liabilities 9,695 5,524 6,293
Total liabilities 21,179 11,400 12,239
Production cost 39,713 24,471 21,624
Exploration expenses $ 242 $ 767 $ 849