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Loans - Schedule of Loans (Parenthetical) (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
ARS ($)
Dec. 31, 2017
ARS ($)
Dec. 31, 2016
ARS ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
ARS ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
ARS ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
ARS ($)
Dec. 31, 2015
ARS ($)
Disclosure of detailed information about borrowings [line items]                    
Repurchase of negotiable obligations         $ 410   $ 309   $ 672  
Loans from banks         335,078   191,063   154,345 $ 105,751
Cancellation of negotiable obligations       $ 15,850 2,634 $ 15,850 1,528 $ 11,248 3,253  
Proceeds from loans $ 39,673 $ 54,719 $ 101,322              
Banco Nacion Argentina [member]                    
Disclosure of detailed information about borrowings [line items]                    
Loans from banks         $ 500   2,500   2,105  
Bank overdrafts                 1,440  
Banco Nacion Argentina [member] | Badlar Variable Rate Plus Margin of 3.5 Percentage [member]                    
Disclosure of detailed information about borrowings [line items]                    
Loans accrued             $ 1,500   $ 2,000  
Interest rate       3.50% 3.50% 3.50% 3.50% 3.50% 3.50%  
Banco Nacion Argentina [member] | Fixed interest rate [member]                    
Disclosure of detailed information about borrowings [line items]                    
Loans accrued             $ 1,000      
Interest rate           20.00% 20.00%      
Banco Nacion Argentina [member] | Badlar Variable Rate Plus Spread of 4 Percentage [member]                    
Disclosure of detailed information about borrowings [line items]                    
Loans accrued                 $ 105  
Interest rate               4.00% 4.00%  
Export Pre financing [member] | Banco Nacion Argentina [member]                    
Disclosure of detailed information about borrowings [line items]                    
Loans from banks         $ 5,264          
Export Pre financing [member] | Banco Nacion Argentina [member] | Two percentage fixed interest rate [member]                    
Disclosure of detailed information about borrowings [line items]                    
Loans accrued         $ 3,008   $ 1,116      
Interest rate       2.00% 2.00% 2.00% 2.00%      
Export Pre financing [member] | Banco Nacion Argentina [member] | Six point five percentage fixed interest rate [member]                    
Disclosure of detailed information about borrowings [line items]                    
Loans accrued         $ 2,256          
Interest rate       6.50% 6.50%          
Negotiable obligations and financial loans secured by cash flows [member]                    
Disclosure of detailed information about borrowings [line items]                    
Proceeds from loans   $ 492 $ 4,960