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Provisions - Summary of Changes in Group's Provisions (Detail) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Financial Results [line items]      
Net exchange and translation differences $ 16,025 $ 15,287 $ 25,625
Reclassifications and other movements (3,203)   (2,373)
Non current [member]      
Disclosure of Financial Results [line items]      
Provisions beginning balance 47,358 39,623 26,564
Increases charged to expenses 6,823 5,661 4,765
Decreases charged to income (1,568) (169) (748)
Amounts incurred due to payments/utilization (25) (39)  
Net exchange and translation differences 8,357 7,651 13,058
Deconsolidation of subsidiaries   (4,436)  
Reclassifications and other movements (6,211) (933) (4,016)
Provisions ending balance 54,734 47,358 39,623
Non current [member] | Provision for Pending Lawsuits and Contingencies [member]      
Disclosure of Financial Results [line items]      
Provisions beginning balance 9,205 10,375 7,014
Increases charged to expenses 2,394 1,579 2,062
Decreases charged to income (1,570) (158) (434)
Amounts incurred due to payments/utilization (25) 9  
Net exchange and translation differences 1,483 1,221 2,383
Deconsolidation of subsidiaries   (2,213)  
Reclassifications and other movements 180 (1,608) (650)
Provisions ending balance 11,667 9,205 10,375
Non current [member] | Provision for environmental liabilities [member]      
Disclosure of Financial Results [line items]      
Provisions beginning balance 530 1,620 1,269
Increases charged to expenses 1,483 962 986
Decreases charged to income (6)    
Net exchange and translation differences   159 464
Deconsolidation of subsidiaries   (1,351)  
Reclassifications and other movements (811) (860) (1,099)
Provisions ending balance 1,196 530 1,620
Non current [member] | Provision for Hydrocarbon Wells Abandonment Obligations [member]      
Disclosure of Financial Results [line items]      
Provisions beginning balance 37,623 27,380 18,087
Increases charged to expenses 2,946 3,023 1,694
Decreases charged to income 8 (10) (314)
Amounts incurred due to payments/utilization   (48)  
Net exchange and translation differences 6,874 6,245 10,109
Deconsolidation of subsidiaries   (515)  
Reclassifications and other movements (5,580) 1,548 (2,196)
Provisions ending balance 41,871 37,623 27,380
Non current [member] | Provision for pending lawsuits and contingencies [member]      
Disclosure of Financial Results [line items]      
Provisions beginning balance   248 194
Increases charged to expenses   97 23
Decreases charged to income   (1)  
Net exchange and translation differences   26 102
Deconsolidation of subsidiaries   (357)  
Reclassifications and other movements   (13) (71)
Provisions ending balance     248
Current [member]      
Disclosure of Financial Results [line items]      
Provisions beginning balance 1,994 2,009 2,399
Increases charged to expenses 83 367 95
Decreases charged to income (408) (335) (154)
Amounts incurred due to payments/utilization (1,363) (1,705) (1,758)
Net exchange and translation differences 196 156 372
Increase from JO interest acquisition     (504)
Deconsolidation of subsidiaries   (652)  
Reclassifications and other movements 1,940 2,154 1,559
Provisions ending balance 2,442 1,994 2,009
Current [member] | Provision for Pending Lawsuits and Contingencies [member]      
Disclosure of Financial Results [line items]      
Provisions beginning balance 569 149 851
Increases charged to expenses 83 335 95
Decreases charged to income (410) (258) (141)
Amounts incurred due to payments/utilization (187) (239) (374)
Net exchange and translation differences 75 7 10
Deconsolidation of subsidiaries   (11)  
Reclassifications and other movements 558 586 (292)
Provisions ending balance 688 569 149
Current [member] | Provision for environmental liabilities [member]      
Disclosure of Financial Results [line items]      
Provisions beginning balance 868 1,400 1,145
Increases charged to expenses   32  
Amounts incurred due to payments/utilization (661) (869) (1,030)
Net exchange and translation differences   52 186
Deconsolidation of subsidiaries   (607)  
Reclassifications and other movements 811 860 1,099
Provisions ending balance 1,018 868 1,400
Current [member] | Provision for Hydrocarbon Wells Abandonment Obligations [member]      
Disclosure of Financial Results [line items]      
Provisions beginning balance 557 429 376
Decreases charged to income 2 (77)  
Amounts incurred due to payments/utilization (515) (584) (283)
Net exchange and translation differences 121 94 159
Increase from JO interest acquisition     (504)
Reclassifications and other movements 571 695 681
Provisions ending balance $ 736 557 429
Current [member] | Provision for pending lawsuits and contingencies [member]      
Disclosure of Financial Results [line items]      
Provisions beginning balance   31 27
Decreases charged to income     (13)
Amounts incurred due to payments/utilization   (13) (71)
Net exchange and translation differences   3 17
Deconsolidation of subsidiaries   (34)  
Reclassifications and other movements   $ 13 71
Provisions ending balance     $ 31