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Loans - Details of Negotiable Obligations (Detail)
SFr in Millions, $ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
ARS ($)
Dec. 31, 2018
CHF (SFr)
Dec. 31, 2017
ARS ($)
Dec. 31, 2016
ARS ($)
Dec. 31, 2015
ARS ($)
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 335,078   $ 191,063 $ 154,345 $ 105,751
Noncurrent   270,252   151,727 127,568  
Current   64,826   39,336 26,777  
Negotiable obligations [member]            
Disclosure of detailed information about borrowings [line items]            
Noncurrent   245,628   144,326 115,310  
Current   $ 24,416   20,828 8,760  
Negotiable obligations [member] | 2016 September [member] | Class LI [Member] | Fixed interest rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value | SFr     SFr 300      
Interest rate 3.75% 3.75% 3.75%      
Principal Maturity 2019          
Noncurrent       5,731 4,673  
Current   $ 11,563   54 45  
Negotiable obligations [member] | 2012 November and December [member] | Class XI [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   2,110        
Principal Maturity -          
Current         260  
Negotiable obligations [member] | 2012 December and 2013 March [member] | Class XIII [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   2,828        
Principal Maturity -          
Noncurrent         1,414  
Current       1,427 1,439  
Negotiable obligations [member] | 2013 April [member] | Class XVII [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 2,250        
Interest rate 2.25% 2.25% 2.25%      
Interest rate 52.75% 52.75% 52.75%      
Principal Maturity 2020          
Noncurrent   $ 1,125   2,250 2,250  
Current   1,330   96 101  
Negotiable obligations [member] | 2013 April [member] | Class XIX [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 89          
Principal Maturity -          
Current         1,413  
Negotiable obligations [member] | 2013 June [member] | Class XX [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 1,265        
Interest rate 2.25% 2.25% 2.25%      
Interest rate 50.70% 50.70% 50.70%      
Principal Maturity 2020          
Noncurrent   $ 633   1,265 1,265  
Current   657   12 12  
Negotiable obligations [member] | 2014 March [member] | Class XXIX [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 500        
Interest rate 48.99% 48.99% 48.99%      
Principal Maturity 2020          
Noncurrent   $ 200   350 500  
Current   162   158 8  
Negotiable obligations [member] | 2014 September [member] | Class XXXIV [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 1,000        
Interest rate 0.10% 0.10% 0.10%      
Interest rate 48.97% 48.97% 48.97%      
Principal Maturity 2024          
Noncurrent   $ 833   1,000 1,000  
Current   299   54 76  
Negotiable obligations [member] | 2014 September [member] | Class XXXV [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 750        
Interest rate 3.50% 3.50% 3.50%      
Interest rate 52.37% 52.37% 52.37%      
Principal Maturity 2019          
Noncurrent       500 750  
Current   $ 571   298 64  
Negotiable obligations [member] | 2015 February [member] | Class XXXVI [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 950        
Interest rate 4.74% 4.74% 4.74%      
Interest rate 49.92% 49.92% 49.92%      
Principal Maturity 2020          
Noncurrent   $ 950   950 950  
Current   187   92 126  
Negotiable obligations [member] | 2015 February [member] | Class XXXVII [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   250        
Principal Maturity -          
Current         260  
Negotiable obligations [member] | 2015 April [member] | Class XXXVIII [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 935        
Interest rate 4.75% 4.75% 4.75%      
Interest rate 54.72% 54.72% 54.72%      
Principal Maturity 2020          
Noncurrent   $ 312   626 935  
Current   $ 390   362 69  
Negotiable obligations [member] | 2015 April [member] | Class XXXIX [Member] | Fixed interest rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 1,500          
Interest rate 8.50% 8.50% 8.50%      
Principal Maturity 2025          
Noncurrent   $ 56,062   27,731 23,617  
Current   2,025   1,002 853  
Negotiable obligations [member] | 2015 July [member] | Class XL [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   500        
Principal Maturity -          
Current         529  
Negotiable obligations [member] | 2015 September [member] | Class XLI [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 1,900        
Interest rate 48.87% 48.87% 48.87%      
Principal Maturity 2020          
Noncurrent   $ 633   1,267 1,900  
Current   801   736 145  
Negotiable obligations [member] | 2015 September and December [member] | Class XLII [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 1,697        
Interest rate 4.00% 4.00% 4.00%      
Interest rate 52.87% 52.87% 52.87%      
Principal Maturity 2020          
Noncurrent   $ 1,697   1,697 1,697  
Current   243   110 148  
Negotiable obligations [member] | 2015 October [member] | Class XLIII [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 2,000        
Interest rate 50.48% 50.48% 50.48%      
Principal Maturity 2023          
Noncurrent   $ 2,000   2,000 2,000  
Current   196   80 106  
Negotiable obligations [member] | 2015 December [member] | Class XLIV [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   1,400        
Principal Maturity -          
Noncurrent         1,400  
Current       1,422 23  
Negotiable obligations [member] | 2016 March [member] | Class XLV [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   150        
Principal Maturity -          
Current         153  
Negotiable obligations [member] | 2016 March [member] | Class XLVI [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 1,350        
Interest rate 6.00% 6.00% 6.00%      
Interest rate 53.09% 53.09% 53.09%      
Principal Maturity 2021          
Noncurrent   $ 1,350   1,350 1,350  
Current   $ 234   114 152  
Negotiable obligations [member] | 2016 March [member] | Class XLVII [Member] | Fixed interest rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 1,000          
Interest rate 8.50% 8.50% 8.50%      
Principal Maturity 2021          
Noncurrent   $ 37,600   18,599 15,840  
Current   870   430 367  
Negotiable obligations [member] | 2016 April [member] | Class XLlX [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 535        
Interest rate 6.00% 6.00% 6.00%      
Interest rate 56.42% 56.42% 56.42%      
Principal Maturity 2020          
Noncurrent   $ 535   535 535  
Current   $ 62   31 33  
Negotiable obligations [member] | 2016 April [member] | Class XLVIII [Member] | Fixed interest rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 46          
Interest rate 8.25% 8.25% 8.25%      
Principal Maturity 2020          
Noncurrent   $ 1,723   852 726  
Current   29   14 12  
Negotiable obligations [member] | 2016 July [member] | Class L [Member] | BADLAR variable rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 11,248        
Interest rate 4.00% 4.00% 4.00%      
Interest rate 47.84% 47.84% 47.84%      
Principal Maturity 2020          
Noncurrent   $ 11,248   11,248 11,248  
Current   1,238   651 696  
Negotiable obligations [member] | 2017 May [member] | Class LII [member] | Fixed interest rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 4,602        
Interest rate 16.50% 16.50% 16.50%      
Principal Maturity 2022          
Noncurrent   $ 4,602   4,602    
Current   110   110    
Negotiable obligations [member] | 2017 December [member] | Class II [member] | BADLAR variable rate [member] | Metrogas [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 513        
Interest rate 10.00% 10.00% 10.00%      
Interest rate 57.81% 57.81% 57.81%      
Principal Maturity 2019          
Current   $ 519        
Negotiable obligations [member] | 2017 December [member] | Class LIV [member] | Fixed interest rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 750          
Interest rate 7.00% 7.00% 7.00%      
Principal Maturity 2047          
Noncurrent   $ 27,855   13,846    
Current   $ 70   44    
Negotiable obligations [member] | 1998 [member] | Fixed interest rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 15          
Interest rate 10.00% 10.00% 10.00%      
Principal Maturity 2028          
Noncurrent   $ 557   276 63  
Current   $ 9   5 4  
Negotiable obligations [member] | 2013 July [member] | Class XXII [Member] | Fixed interest rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 92          
Interest rate 3.50% 3.50% 3.50%      
Principal Maturity 2020          
Noncurrent   $ 456   451 576  
Current   $ 461   230 197  
Negotiable obligations [member] | 2013 October [member] | Class XXIV [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 150          
Principal Maturity -          
Noncurrent         419  
Current       498 570  
Negotiable obligations [member] | 2013 December 2014 April and 2015 February and December [member] | Class XXVI [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 862          
Principal Maturity -          
Noncurrent         13,410  
Current       8,422 40  
Negotiable obligations [member] | 2014 April, 2015 February and 2016 October [member] | Class XXVIII [Member] | Fixed interest rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 1,522          
Interest rate 8.75% 8.75% 8.75%      
Principal Maturity 2024          
Noncurrent   $ 57,233   28,311 24,111  
Current   $ 1,210   599 509  
Negotiable obligations [member] | 2014 June [member] | Class XXXIII [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 66          
Principal Maturity -          
Current         350  
Negotiable obligations [member] | 2017 July and December [member] | Class LIII [member] | Fixed interest rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 1,000          
Interest rate 6.95% 6.95% 6.95%      
Principal Maturity 2027          
Noncurrent   $ 38,024   18,889    
Current   $ 1,180   445    
Negotiable obligations [member] | 2013 January [member] | Series A-L [member] | Metrogas [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 177          
Principal Maturity -          
Noncurrent         2,461  
Current       3,076    
Negotiable obligations [member] | 2013 January [member] | Series A-U [member] | Metrogas [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 18          
Principal Maturity -          
Noncurrent         $ 220  
Current       $ 256