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Supplemental Information on Oil And Gas Producing Activities (Unaudited) - Results of Operations from Oil and Gas Producing Activities (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Oil And Gas Producing Activities [Line Items]      
Total net revenues $ 261,072 $ 216,644 $ 159,387
Other (4,110) (3,299) (2,743)
Net profit (loss) before income tax 8,703 (29,804) 29,063
Income tax expense / benefit 3,969 1,425 (24,637)
Argentina [member]      
Disclosure Of Oil And Gas Producing Activities [Line Items]      
Net sales to unaffiliated parties 521 18,489 13,812
Net intersegment sales 115,955 95,496 64,191
Total net revenues 116,476 113,985 78,003
Production costs (69,944) (65,823) (43,955)
Exploration expenses (2,279) (3,140) (2,342)
Depreciation and expense for valuation allowances (45,277) (38,036) (22,861)
Impairment of Property, plan and equipment 5,032 (34,943) (2,361)
Other (2,706) (836) (401)
Net profit (loss) before income tax 1,302 (28,793) 6,083
Income tax expense / benefit (456) 10,434 (2,114)
Results of oil and gas producing activities 846 (18,359) 3,969
Other foreign [Member]      
Disclosure Of Oil And Gas Producing Activities [Line Items]      
Net sales to unaffiliated parties   98 197
Total net revenues   98 197
Production costs   (39) (89)
Exploration expenses (168) (17) (127)
Depreciation and expense for valuation allowances   (90) (148)
Impairment of Property, plan and equipment     (174)
Other     (56)
Net profit (loss) before income tax (168) (48) (397)
Income tax expense / benefit 59 16 79
Results of oil and gas producing activities (109) (32) (318)
Worldwide [Member]      
Disclosure Of Oil And Gas Producing Activities [Line Items]      
Net sales to unaffiliated parties 521 18,587 14,009
Net intersegment sales 115,955 95,496 64,191
Total net revenues 116,476 114,083 78,200
Production costs (69,944) (65,862) (44,044)
Exploration expenses (2,447) (3,157) (2,469)
Depreciation and expense for valuation allowances (45,277) (38,126) (23,009)
Impairment of Property, plan and equipment 5,032 (34,943) (2,535)
Other (2,706) (836) (457)
Net profit (loss) before income tax 1,134 (28,841) 5,686
Income tax expense / benefit (397) 10,450 (2,035)
Results of oil and gas producing activities $ 737 $ (18,391) $ 3,651