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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Oil And Gas Producing Activities [line items]      
Other $ (9,919) $ (10,482) $ (6,212)
Pre-tax income (loss) from producing activities (56,428) (7,010) 90,144
Income tax expense / benefit (14,589) (26,369) (51,538)
Argentina [member]      
Disclosure Of Oil And Gas Producing Activities [line items]      
Net sales to unaffiliated parties 2,419 1,949 3,085
Net intersegment sales 289,421 286,585 207,480
Total net revenues 291,840 288,534 210,565
Production costs (193,166) (164,562) (114,381)
Exploration expenses (5,688) (6,045) (5,185)
Depreciation of property, plant and equipment; intangible and right-of-use assets (137,183) (124,977) (72,044)
Impairment of Property, plant and equipment 7,475 (40,561) 3,265
Other 889 (6,569) (2,839)
Pre-tax income (loss) from producing activities (35,833) (54,180) 19,381
Income tax expense / benefit 10,750 16,254 (5,814)
Results of oil and gas producing activities (25,083) (37,926) 13,567
Other foreign [Member]      
Disclosure Of Oil And Gas Producing Activities [line items]      
Net sales to unaffiliated parties 6 120  
Total net revenues 6 120  
Production costs (165) (242)  
Exploration expenses (169) (734) (224)
Depreciation of property, plant and equipment; intangible and right-of-use assets (21) (980)  
Impairment of Property, plant and equipment     (365)
Other 231 (56) (168)
Pre-tax income (loss) from producing activities (118) (1,892) (757)
Income tax expense / benefit 41 417 227
Results of oil and gas producing activities (77) (1,475) (530)
Worldwide [member]      
Disclosure Of Oil And Gas Producing Activities [line items]      
Net sales to unaffiliated parties 2,425 2,069 3,085
Net intersegment sales 289,421 286,585 207,480
Total net revenues 291,846 288,654 210,565
Production costs (193,331) (164,804) (114,381)
Exploration expenses (5,857) (6,779) (5,409)
Depreciation of property, plant and equipment; intangible and right-of-use assets (137,204) (125,957) (72,044)
Impairment of Property, plant and equipment 7,475 (40,561) 2,900
Other 1,120 (6,625) (3,007)
Pre-tax income (loss) from producing activities (35,951) (56,072) 18,624
Income tax expense / benefit 10,791 16,671 (5,587)
Results of oil and gas producing activities $ (25,160) $ (39,401) $ 13,037