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Provisions - Rollforward (Details) - ARS ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Provisions    
Aggregate provisions to cover potential losses $ 2,088  
Regulatory Liability Provisions Offset with Receivables 56  
Restricted funds included in other receivables 98  
Current    
Balance in the beginning 271 $ 207
Additions/(recoveries), Capital 77  
Reclassifications 619 278
Uses, Debt recognition (206) (42)
Uses, Payments (355) (172)
Balance at the end 406 271
Non-current    
Balance in the beginning 1,352 1,165
Additions/(recoveries), Capital 578 234
Additions/(recoveries), Interest 320 207
Reclassifications (619) (251)
Uses, Debt recognition   (1)
Uses, Payments (5) (2)
Balance at the end 1,626 1,352
Total provisions    
Total provisions in the beginning 1,623 1,372
Additions/(recoveries), Capital 655 234
Additions/(recoveries), Interest 320 207
Reclassifications   27
Uses, Debt recognition (206) (43)
Uses, Payments (360) (174)
Total provisions at the end 2,032 1,623
Other information    
Additions/(recoveries), Capital, charged to provisions 590 187
Additions/(recoveries), Capital, charged to PP&E (CAPEX) 35 45
Additions/(recoveries), Capital, charged to currency translation adjustments 3 2
Additions/(recoveries), Capital, charged to acquisition of Tuves Paraguay 27  
Provision for civil and commercial proceedings    
Current    
Balance in the beginning 109 112
Additions/(recoveries), Capital 76  
Reclassifications 104 47
Uses, Debt recognition (66) (15)
Uses, Payments (65) (35)
Balance at the end 158 109
Non-current    
Balance in the beginning 261 240
Additions/(recoveries), Capital 150 14
Additions/(recoveries), Interest 53 54
Reclassifications (104) (47)
Balance at the end 360 261
Provision for labor claims    
Current    
Balance in the beginning 91 51
Reclassifications 232 159
Uses, Debt recognition   (27)
Uses, Payments (223) (92)
Balance at the end 100 91
Non-current    
Balance in the beginning 377 329
Additions/(recoveries), Capital 315 130
Additions/(recoveries), Interest 141 78
Reclassifications (232) (159)
Uses, Debt recognition   (1)
Balance at the end 601 377
Provision for regulatory, tax and other matters claims    
Current    
Balance in the beginning 71 44
Additions/(recoveries), Capital 1  
Reclassifications 283 72
Uses, Debt recognition (140)  
Uses, Payments (67) (45)
Balance at the end 148 71
Non-current    
Balance in the beginning 416 407
Additions/(recoveries), Capital 78 43
Additions/(recoveries), Interest 83 11
Reclassifications (283) (45)
Balance at the end 294 416
Asset retirement obligations    
Non-current    
Balance in the beginning 298 189
Additions/(recoveries), Capital 35 47
Additions/(recoveries), Interest 43 64
Uses, Payments (5) (2)
Balance at the end $ 371 $ 298