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Supplemental Information on Oil And Gas Producing Activities (Unaudited) - Summary of Capitalized Costs, Along with the related Accumulated Depreciation and Allowances (Detail) - ARS ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Argentina [member]      
Disclosure of information about consolidated structured entities [Line Items]      
Mineral property, wells and related equipment $ 770,461 $ 621,717 $ 451,900
Support equipment and facilities 22,171 18,263 16,920
Drilling and work in progress 40,567 36,966 45,715
Unproved oil and gas properties 6,189 4,788 6,473
Total capitalized costs 839,388 681,734 521,008
Accumulated depreciation and valuation allowances (600,086) (473,814) (327,579)
Net capitalized costs 239,302 207,920 193,429
Other foreign [Member]      
Disclosure of information about consolidated structured entities [Line Items]      
Mineral property, wells and related equipment     4,312
Unproved oil and gas properties 558 526 451
Total capitalized costs 558 526 4,763
Accumulated depreciation and valuation allowances     (3,811)
Net capitalized costs 558 526 952
Worldwide [Member]      
Disclosure of information about consolidated structured entities [Line Items]      
Mineral property, wells and related equipment 770,461 621,717 456,212
Support equipment and facilities 22,171 18,263 16,920
Drilling and work in progress 40,567 36,966 45,715
Unproved oil and gas properties 6,747 5,314 6,924
Total capitalized costs 839,946 682,260 525,771
Accumulated depreciation and valuation allowances (600,086) (473,814) (331,390)
Net capitalized costs $ 239,860 $ 208,446 $ 194,381