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Investment in Joint Venture - Information of Assets and Liabilities (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of joint operations [line items]      
Noncurrent assets $ 383,420 $ 333,913 $ 286,480
Current assets 122,298 87,226 76,973
Total assets 505,718 421,139 363,453
Noncurrent liabilities 250,451 220,012 163,201
Current liabilities 102,734 82,466 79,791
Total liabilities 353,185 302,478 242,992
Exploration expenses 2,456 3,155 2,473
Joint Ventures [member]      
Disclosure of joint operations [line items]      
Noncurrent assets 66,887 63,145 47,322
Current assets 2,417 2,602 944
Total assets 69,304 65,747 48,266
Noncurrent liabilities 5,876 5,946 4,593
Current liabilities 5,524 6,293 6,391
Total liabilities 11,400 12,239 10,984
Production Cost 24,471 21,624 12,959
Exploration expenses $ 767 $ 849 $ 395