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Provisions - Summary of Changes in Group's Provisions (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Non current [member]      
Disclosure of provisions [line items]      
Provisions beginning balance $ 144,768 $ 83,388 $ 54,734
Increases charged to expenses 23,462 27,564 10,126
Decreases charged to income (11,804) (5,371) (14,621)
Amounts incurred due to payments/utilization (43) (73) (76)
Net exchange and translation differences 51,185 43,103 50,995
Increases due to business combination     465
Result from net monetary position (35) (92) (204)
Reclassifications and other movements (21,045) (3,751) (18,031)
Provisions ending balance 186,488 144,768 83,388
Non current [member] | Provision for lawsuits and contingencies [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 43,833 21,235 11,667
Increases charged to expenses 8,917 18,460 3,320
Decreases charged to income (6,331) (2,358) (371)
Amounts incurred due to payments/utilization (43) (73) (76)
Net exchange and translation differences 9,475 7,405 6,826
Result from net monetary position (35) (92) (204)
Reclassifications and other movements (5,447) (744) 73
Provisions ending balance 50,369 43,833 21,235
Non current [member] | Provision for environmental liabilities [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 3,828 3,720 1,196
Increases charged to expenses 3,428 1,695 3,021
Decreases charged to income (224) (63)  
Net exchange and translation differences 525 479 495
Increases due to business combination     465
Reclassifications and other movements (2,026) (2,003) (1,457)
Provisions ending balance 5,531 3,828 3,720
Non current [member] | Provision for Hydrocarbon Wells Abandonment Obligations [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 97,107 58,433 41,871
Increases charged to expenses 11,117 7,409 3,785
Decreases charged to income (5,249) (2,950) (14,250)
Net exchange and translation differences 41,185 35,219 43,674
Reclassifications and other movements (13,572) (1,004) (16,647)
Provisions ending balance 130,588 97,107 58,433
Current [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 5,460 4,529 2,442
Increases charged to expenses 219 9 357
Decreases charged to income (1,039) (744) (266)
Amounts incurred due to payments/utilization (2,760) (4,789) (2,576)
Net exchange and translation differences 1,470 1,628 1,309
Result from net monetary position     66
Reclassifications and other movements 2,783 4,827 3,197
Provisions ending balance 6,133 5,460 4,529
Current [member] | Provision for lawsuits and contingencies [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 1,285 1,123 688
Increases charged to expenses 219 9 357
Decreases charged to income (1,039) (744) (266)
Amounts incurred due to payments/utilization (132) (194) (129)
Net exchange and translation differences 498 443 471
Result from net monetary position     66
Reclassifications and other movements 1,103 648 (64)
Provisions ending balance 1,934 1,285 1,123
Current [member] | Provision for environmental liabilities [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 1,910 1,622 1,018
Amounts incurred due to payments/utilization (1,330) (1,821) (933)
Net exchange and translation differences 12 106 80
Reclassifications and other movements 2,026 2,003 1,457
Provisions ending balance 2,618 1,910 1,622
Current [member] | Provision for Hydrocarbon Wells Abandonment Obligations [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 2,265 1,784 736
Amounts incurred due to payments/utilization (1,298) (2,774) (1,514)
Net exchange and translation differences 960 1,079 758
Reclassifications and other movements (346) 2,176 1,804
Provisions ending balance $ 1,581 $ 2,265 $ 1,784