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Loans - Details of Negotiable Obligations (Detail)
SFr in Millions, $ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
ARS ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CHF (SFr)
Dec. 31, 2016
ARS ($)
Dec. 31, 2015
ARS ($)
Dec. 31, 2014
ARS ($)
Disclosure of detailed information about borrowings [line items]            
Principal value $ 191,063     $ 154,345 $ 105,751 $ 49,305
Noncurrent 151,727     127,568 77,934  
Current 39,336     26,777 27,817  
Negotiable obligations [member]            
Disclosure of detailed information about borrowings [line items]            
Noncurrent 144,326     115,310 71,931  
Current $ 20,828     8,760 12,031  
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%      
Maturity 2028          
Noncurrent $ 276     63 49  
Current $ 5     4 3  
Negotiable obligations [member] | 2012 October and December [member] | Class X [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 552        
Maturity -          
Current         7,258  
Negotiable obligations [member] | 2012 November and December [member] | Class XI [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 2,110          
Maturity -          
Noncurrent         1,055  
Current       260 1,129  
Negotiable obligations [member] | 2012 December and 2013 March [member] | Class XIII [Member] | BADLAR Variable Rate [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 2,828          
Interest rate 4.75% 4.75% 4.75%      
Interest rate 26.77% 26.77% 26.77%      
Maturity 2018          
Noncurrent       1,414 2,828  
Current $ 1,427     1,439 25  
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 24.82% 24.82% 24.82%      
Maturity 2020          
Noncurrent $ 2,250     2,250 2,250  
Current $ 96     101 91  
Negotiable obligations [member] | 2013 April [member] | Class XIX [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 89        
Maturity -          
Noncurrent         1,156  
Current       1,413 3  
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 24.20% 24.20% 24.20%      
Maturity 2020          
Noncurrent $ 1,265     1,265 1,265  
Current $ 12     12 12  
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%      
Maturity 2020          
Noncurrent $ 451     576 630  
Current $ 230     197 162  
Negotiable obligations [member] | 2013 October [member] | Class XXIV [Member] | London interbank offered rate (LIBOR) 1 [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 150        
Interest rate 7.50% 7.50% 7.50%      
Interest rate 8.92% 8.92% 8.92%      
Maturity 2018          
Noncurrent       419 802  
Current $ 498     570 471  
Negotiable obligations [member] | 2013 December 2014 April and 2015 February and December [member] | Class XXVI [Member] | Fixed interest rate [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 862        
Interest rate 8.88% 8.88% 8.88%      
Maturity 2018          
Noncurrent       13,410 11,057  
Current $ 8,422     40 33  
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%      
Maturity 2024          
Noncurrent $ 28,311     24,111 17,212  
Current 599     509 364  
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 21.74% 21.74% 21.74%      
Maturity 2020          
Noncurrent $ 350     500 500  
Current 158     8 7  
Negotiable obligations [member] | 2014 June [member] | Class XXXII [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 465          
Maturity -          
Current         157  
Negotiable obligations [member] | 2014 June [member] | Class XXXIII [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 66        
Maturity -          
Noncurrent         287  
Current       350 574  
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 20.08% 20.08% 20.08%      
Maturity 2024          
Noncurrent $ 1,000     1,000 1,000  
Current 54     76 56  
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 23.48% 23.48% 23.48%      
Maturity 2019          
Noncurrent $ 500     750 750  
Current 298     64 49  
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 24.47% 24.47% 24.47%      
Maturity 2020          
Noncurrent $ 950     950 950  
Current 92     126 95  
Negotiable obligations [member] | 2015 February [member] | Class XXXVII [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 250          
Maturity -          
Noncurrent         250  
Current       260 9  
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 24.89% 24.89% 24.89%      
Maturity 2020          
Noncurrent $ 626     935 935  
Current $ 362     69 55  
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%      
Maturity 2025          
Noncurrent $ 27,731     23,617 19,369  
Current 1,002     853 1,111  
Negotiable obligations [member] | 2015 July [member] | Class XL [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 500          
Maturity -          
Noncurrent         500  
Current       529 26  
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 19.98% 19.98% 19.98%      
Maturity 2020          
Noncurrent $ 1,267     1,900 1,900  
Current 736     145 112  
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 23.98% 23.98% 23.98%      
Maturity 2020          
Noncurrent $ 1,697     1,697 1,697  
Current 110     148 119  
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 20.30% 20.30% 20.30%      
Maturity 2023          
Noncurrent $ 2,000     2,000 2,000  
Current 80     106 83  
Negotiable obligations [member] | 2015 December [member] | Class XLIV [Member] | BADLAR Variable Rate [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 1,400          
Interest rate 4.75% 4.75% 4.75%      
Interest rate 26.53% 26.53% 26.53%      
Maturity 2018          
Noncurrent       1,400 1,400  
Current $ 1,422     23 25  
Negotiable obligations [member] | 2016 March [member] | Class XLV [Member]            
Disclosure of detailed information about borrowings [line items]            
Principal value $ 150          
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 25.83% 25.83% 25.83%      
Maturity 2021          
Noncurrent $ 1,350     1,350    
Current $ 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%      
Maturity 2021          
Noncurrent $ 18,599     15,840    
Current $ 430     367    
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%      
Maturity 2020          
Noncurrent $ 852     726    
Current 14     12    
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 28.57% 28.57% 28.57%      
Maturity 2020          
Noncurrent $ 535     535    
Current 31     33    
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 25.46% 25.46% 25.46%      
Maturity 2020          
Noncurrent $ 11,248     11,248    
Current $ 651     696    
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%      
Maturity 2019          
Noncurrent $ 5,731     4,673    
Current 54     45    
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%      
Maturity 2022          
Noncurrent $ 4,602          
Current $ 110          
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%      
Maturity 2027          
Noncurrent $ 18,889          
Current $ 445          
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%      
Maturity 2047          
Noncurrent $ 13,846          
Current $ 44          
Negotiable obligations [member] | 2013 January [member] | Series A-L [member] | Fixed interest rate [member] | Metrogas [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 177        
Interest rate 8.88% 8.88% 8.88%      
Maturity 2018          
Noncurrent       2,461 1,906  
Current $ 3,076       2  
Negotiable obligations [member] | 2013 January [member] | Series A-U [member] | Fixed interest rate [member] | Metrogas [member]            
Disclosure of detailed information about borrowings [line items]            
Principal value   $ 18        
Interest rate 8.88% 8.88% 8.88%      
Maturity 2018          
Noncurrent       $ 220 $ 183  
Current $ 256