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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - ARS ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of cash and cash equivalents [line items]        
Cash and banks $ 6,678 $ 9,672 $ 7,922  
Short-term investments 31,558 15 27  
Financial assets at fair value through profit or loss 7,792 19,051 2,808  
Total 46,028 $ 28,738 $ 10,757 $ 15,387
Banco Nacion Argentina [member]        
Disclosure of cash and cash equivalents [line items]        
Term deposits and other investments $ 5,084