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32 Income tax and deferred tax (Details) - ARS ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of income tax deferred tax [line items]        
Tax loss carryforward $ 248 $ 113
Inventories   28
Trade receivables and other receivables 1,351 754 932 1,006
Trade payables and other payables 677 819 4,092 889
Salaries and social security taxes payable 255 154 103 (201)
Benefit plans 76 147 222 459
Tax liabilities 19 25 33 117
Provisions 818 916 724 (1,143)
Deferred tax asset 3,444 2,815 6,106 1,268
Property, plant and equipment (23,383) (26,740) (22,498) (15,628)
Financial assets at fair value through profit or loss (298) (283) (445) (809)
Borrowings (2) (5) (9) (91)
Tax inflation adjustment (3,470) (3,087)    
Deferred tax liability (27,153) (30,115) (22,952) (16,528)
Net deferred tax liability (23,709) (27,300) (16,847) $ (15,260)
Result from exposure to inflation [member]        
Summary of income tax deferred tax [line items]        
Tax loss carryforward (113)  
Inventories   (19)  
Trade receivables and other receivables (200) (326) (775)  
Trade payables and other payables (217) (1,431) 1,586  
Salaries and social security taxes payable (40) (36) 273  
Benefit plans (39) (78) (270)  
Tax liabilities (7) (11) (91)  
Provisions (243) (253) 1,580  
Deferred tax asset (746) (2,135) 2,171  
Property, plant and equipment 7,098 7,867 1,890  
Financial assets at fair value through profit or loss 75 156 785  
Borrowings 2 3 80  
Tax inflation adjustment 820    
Deferred tax liability 7,995 8,026 2,755  
Net deferred tax liability 7,249 5,891 4,926  
Charged to profit and loss [member]        
Summary of income tax deferred tax [line items]        
Tax loss carryforward 248  
Inventories   (9)  
Trade receivables and other receivables 797 148 701  
Trade payables and other payables 75 (1,842) 1,617  
Salaries and social security taxes payable 141 87 31  
Benefit plans 1 29  
Tax liabilities 1 3 7  
Provisions 145 445 287  
Deferred tax asset 1,408 (1,159) 2,663  
Property, plant and equipment (3,741) (12,109) (8,760)  
Financial assets at fair value through profit or loss (90) 6 (421)  
Borrowings 1 1 2  
Tax inflation adjustment (1,203) (3,087)    
Deferred tax liability (5,033) (15,189) (9,179)  
Net deferred tax liability (3,625) (16,348) (6,516)  
Charged to other comprehensive income [member]        
Summary of income tax deferred tax [line items]        
Tax loss carryforward  
Inventories    
Trade receivables and other receivables  
Trade payables and other payables  
Salaries and social security taxes payable  
Benefit plans (33) 3 4  
Tax liabilities  
Provisions  
Deferred tax asset (33) 3 4  
Property, plant and equipment  
Financial assets at fair value through profit or loss  
Borrowings  
Tax inflation adjustment    
Deferred tax liability  
Net deferred tax liability $ (33) $ 3 $ 4