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PROVISIONS - Rollforward (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Current    
Balance in the beginning $ 1,144  
Incorporation by merger   $ 922
Additions/(recoveries), Capital 236 618
Reclassifications (3,337) 2,684
Debt recognition (43)  
Decreases (3,483) (3,080)
Balance at the end 1,191 1,144
Non-current    
Balance in the beginning 5,335 2,478
Incorporation by merger   3,694
Additions/(recoveries), Capital 1,229 1,403
Additions/(recoveries), Interest 1,775 929
Reclassifications (3,337) (2,684)
Decreases (373) (485)
Balance at the end 4,629 5,335
Total provisions    
Total provisions in the beginning 6,479 2,478
Incorporation by merger   4,616
Additions/(recoveries), Capital 1,465 2,021
Additions/(recoveries), Interest 1,775 929
Debt recognition (43)  
Decreases (3,856) (3,565)
Total provisions at the end 5,820 6,479
Other information    
Additions/(recoveries), Capital, charged to other operating expenses 1,286 1,929
Additions/(recoveries), Capital, charged to rights of use assets 57 74
Additions/(recoveries), Capital, charged from account payable 129  
Additions/(recoveries), Capital, charged to currency translation adjustments (7) 18
Provisions    
Current    
Balance in the beginning 1,144  
Incorporation by merger   922
Additions/(recoveries), Capital 236 618
Reclassifications (3,337) 2,684
Debt recognition (43)  
Decreases (3,483) (3,080)
Balance at the end 1,191 1,144
Non-current    
Balance in the beginning 4,572 1,941
Incorporation by merger   2,852
Additions/(recoveries), Capital 1,174 1,329
Additions/(recoveries), Interest 1,585 1,126
Reclassifications 3,337 (2,676)
Balance at the end 3,994 4,572
Asset retirement obligations    
Non-current    
Balance in the beginning 763 537
Incorporation by merger   842
Additions/(recoveries), Capital 55 74
Additions/(recoveries), Interest 190 (197)
Reclassifications   (8)
Decreases (373) (485)
Balance at the end $ 635 $ 763