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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Oil And Gas Producing Activities [line items]      
Other $ (6,212) $ (4,110) $ (3,299)
Net profit / (loss) before income tax 90,144 8,703 (29,804)
Income tax expense / benefit (51,538) 3,969 1,425
Argentina [member]      
Disclosure Of Oil And Gas Producing Activities [line items]      
Net sales to unaffiliated parties 3,085 521 18,489
Net intersegment sales 207,480 115,955 95,496
Total net revenues 210,565 116,476 113,985
Production costs (114,381) (69,944) (65,823)
Exploration expenses (5,185) (2,279) (3,140)
Depreciation and expense for valuation allowances (72,044) (45,277) (38,036)
Impairment of Property, plan and equipment 3,265 5,032 (34,943)
Other (2,839) (2,706) (836)
Net profit / (loss) before income tax 19,381 1,302 (28,793)
Income tax expense / benefit (5,814) (456) 10,434
Results of oil and gas producing activities 13,567 846 (18,359)
Other foreign [Member]      
Disclosure Of Oil And Gas Producing Activities [line items]      
Net sales to unaffiliated parties     98
Total net revenues     98
Production costs     (39)
Exploration expenses (224) (168) (17)
Depreciation and expense for valuation allowances     (90)
Impairment of Property, plan and equipment (365)    
Other (168)    
Net profit / (loss) before income tax (757) (168) (48)
Income tax expense / benefit 227 59 16
Results of oil and gas producing activities (530) (109) (32)
Worldwide [member]      
Disclosure Of Oil And Gas Producing Activities [line items]      
Net sales to unaffiliated parties 3,085 521 18,587
Net intersegment sales 207,480 115,955 95,496
Total net revenues 210,565 116,476 114,083
Production costs (114,381) (69,944) (65,862)
Exploration expenses (5,409) (2,447) (3,157)
Depreciation and expense for valuation allowances (72,044) (45,277) (38,126)
Impairment of Property, plan and equipment 2,900 5,032 (34,943)
Other (3,007) (2,706) (836)
Net profit / (loss) before income tax 18,624 1,134 (28,841)
Income tax expense / benefit (5,587) (397) 10,450
Results of oil and gas producing activities $ 13,037 $ 737 $ (18,391)