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PROVISIONS - Rollforward (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Current    
Incorporation by merger $ 599  
Additions/(recoveries), Capital 402  
Reclassifications 1,745  
Decreases (2,002)  
Balance at the end 744  
Non-current    
Balance in the beginning 1,611 $ 1,410
Incorporation by merger 2,401  
Additions/(recoveries), Capital 912 359
Additions/(recoveries), Interest 604 78
Reclassifications (1,745)  
Decreases (315) (236)
Balance at the end 3,468 1,611
Total provisions    
Total provisions in the beginning 1,611 1,410
Incorporation by merger 3,000  
Additions/(recoveries), Capital 1,314 359
Additions/(recoveries), Interest 604 78
Decreases (2,317) (236)
Total provisions at the end 4,212 1,611
Other information    
Additions/(recoveries), Capital, charged to currency translation adjustments 60  
Additions/(recoveries), Capital, charged to other operating income and expenses 1,254  
Decrease in provisions relating to RECPAM   90
Provisions    
Current    
Incorporation by merger 599  
Additions/(recoveries), Capital 402  
Reclassifications 1,745  
Decreases (2,002)  
Balance at the end 744  
Non-current    
Balance in the beginning 1,263 1,073
Incorporation by merger 1,854  
Additions/(recoveries), Capital 864 348
Additions/(recoveries), Interest 732 78
Reclassifications (1,741)  
Decreases   (236)
Balance at the end 2,972 1,263
Asset retirement obligations    
Non-current    
Balance in the beginning 348 337
Incorporation by merger 547  
Additions/(recoveries), Capital 48 11
Additions/(recoveries), Interest (128)  
Reclassifications (4)  
Decreases (315)  
Balance at the end $ 496 $ 348