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EQUITY - Capital Market Act (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Nov. 05, 2019
ARS ($)
Vote
$ / shares
shares
Sep. 30, 2019
ARS ($)
Vote
$ / shares
shares
Jun. 28, 2019
ARS ($)
Vote
$ / shares
shares
Jun. 30, 2019
Vote
$ / shares
shares
Dec. 31, 2019
Vote
$ / shares
shares
Dec. 31, 2018
Vote
$ / shares
shares
Equity            
Reduction in nominal value of shares $ 3,784,720   $ 3,672,960      
Nominal value (in pesos per share) | $ / shares   $ 1   $ 1 $ 1 $ 1
Number of vote per share | Vote   1   1 1 1
Outstanding shares | shares   2,157,472,731   2,165,236,424 2,153,688,011 2,153,688,011
Decrease in its treasury shares 15          
Decrease in the inflation adjustment 954          
Decrease in the treasury shares acquisition cost 2,761          
Offsetting entry in Retained earnings $ 1,792          
Class "B"            
Equity            
Reduction in nominal value of shares   $ 7,763,693        
Number of shares cancelled | shares 3,784,720 7,763,693 3,672,960      
Nominal value (in pesos per share) | $ / shares $ 1 $ 1 $ 1      
Number of vote per share | Vote 1 1 1