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Provisions - Summary of Changes in Group's Provisions (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of provisions [line items]      
Net exchange and translation differences $ 81,869 $ 16,025 $ 15,287
Result from net monetary position 1,594    
Reclassifications and other movements   (3,203)  
Non current [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 54,734 47,358 39,623
Increases charged to expenses 10,126 6,823 5,661
Decreases charged to income (14,621) (1,568) (169)
Amounts incurred due to payments/utilization (76) (25) (39)
Net exchange and translation differences 50,995 8,357 7,651
Deconsolidation of subsidiaries     (4,436)
Increases due to business combination 465    
Result from net monetary position (204)    
Reclassifications and other movements (18,031) (6,211) (933)
Provisions ending balance 83,388 54,734 47,358
Non current [member] | Provision for lawsuits and contingencies [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 11,667 9,205 10,375
Increases charged to expenses 3,320 2,394 1,579
Decreases charged to income (371) (1,570) (158)
Amounts incurred due to payments/utilization (76) (25) 9
Net exchange and translation differences 6,826 1,483 1,221
Deconsolidation of subsidiaries     (2,213)
Result from net monetary position (204)    
Reclassifications and other movements 73 180 (1,608)
Provisions ending balance 21,235 11,667 9,205
Non current [member] | Provision for environmental liabilities [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 1,196 530 1,620
Increases charged to expenses 3,021 1,483 962
Decreases charged to income   (6)  
Net exchange and translation differences 495   159
Deconsolidation of subsidiaries     (1,351)
Increases due to business combination 465    
Reclassifications and other movements (1,457) (811) (860)
Provisions ending balance 3,720 1,196 530
Non current [member] | Provision for Hydrocarbon Wells Abandonment Obligations [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 41,871 37,623 27,380
Increases charged to expenses 3,785 2,946 3,023
Decreases charged to income (14,250) 8 (10)
Amounts incurred due to payments/utilization     (48)
Net exchange and translation differences 43,674 6,874 6,245
Deconsolidation of subsidiaries     (515)
Reclassifications and other movements (16,647) (5,580) 1,548
Provisions ending balance 58,433 41,871 37,623
Non current [member] | Provision for pensions [member]      
Disclosure of provisions [line items]      
Provisions beginning balance     248
Increases charged to expenses     97
Decreases charged to income     (1)
Net exchange and translation differences     26
Deconsolidation of subsidiaries     (357)
Reclassifications and other movements     (13)
Current [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 2,442 1,994 2,009
Increases charged to expenses 357 83 367
Decreases charged to income (266) (408) (335)
Amounts incurred due to payments/utilization (2,576) (1,363) (1,705)
Net exchange and translation differences 1,309 196 156
Deconsolidation of subsidiaries     (652)
Result from net monetary position 66    
Reclassifications and other movements 3,197 1,940 2,154
Provisions ending balance 4,529 2,442 1,994
Current [member] | Provision for lawsuits and contingencies [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 688 569 149
Increases charged to expenses 357 83 335
Decreases charged to income (266) (410) (258)
Amounts incurred due to payments/utilization (129) (187) (239)
Net exchange and translation differences 471 75 7
Deconsolidation of subsidiaries     (11)
Result from net monetary position 66    
Reclassifications and other movements (64) 558 586
Provisions ending balance 1,123 688 569
Current [member] | Provision for environmental liabilities [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 1,018 868 1,400
Increases charged to expenses     32
Amounts incurred due to payments/utilization (933) (661) (869)
Net exchange and translation differences 80   52
Deconsolidation of subsidiaries     (607)
Reclassifications and other movements 1,457 811 860
Provisions ending balance 1,622 1,018 868
Current [member] | Provision for Hydrocarbon Wells Abandonment Obligations [member]      
Disclosure of provisions [line items]      
Provisions beginning balance 736 557 429
Decreases charged to income   2 (77)
Amounts incurred due to payments/utilization (1,514) (515) (584)
Net exchange and translation differences 758 121 94
Reclassifications and other movements 1,804 571 695
Provisions ending balance $ 1,784 $ 736 557
Current [member] | Provision for pensions [member]      
Disclosure of provisions [line items]      
Provisions beginning balance     31
Amounts incurred due to payments/utilization     (13)
Net exchange and translation differences     3
Deconsolidation of subsidiaries     (34)
Reclassifications and other movements     $ 13