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4. Significant Accounting Policies (Details 1) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
STATEMENTS OF FINANCIAL POSITION        
Assets R$ 35,930,100 R$ 33,162,377    
Current assets 6,677,846 5,701,834    
Trade accounts receivable (a) (b)   2,733,240    
Other current receivables (a)   409,351    
Accounts receivable - concessions 53,177 149,744    
Contract assets (c) 85,019 0    
Noncurrent assets 29,252,254 27,460,543    
Trade accounts receivable (a)   261,082    
Accounts receivable related to the concession (c) 2,497,514 4,429,237    
Contract assets (c) 3,433,230 0    
Deferred income tax and social contribution 1,007,061 915,492 R$ 814,355  
Investments (d) 2,368,234 2,570,643 2,344,512  
Intangible assets in progress (c)   9,829,450    
Liabilities   33,162,377    
Equity 16,336,214 15,510,503 R$ 14,978,142 R$ 14,480,492
Attributable to controlling shareholder's R$ 16,032,925 15,207,842    
Equity valuation adjustments (e)   895,601    
Accumulated profit   0    
IFRS15        
STATEMENTS OF FINANCIAL POSITION        
Assets   (150,428)    
Current assets   (2,960)    
Trade accounts receivable (a) (b)   (2,960)    
Other current receivables (a)   0    
Accounts receivable - concessions   (66,366)    
Contract assets (c)   66,366    
Noncurrent assets   (147,468)    
Trade accounts receivable (a)   0    
Accounts receivable related to the concession (c)   (2,066,325)    
Contract assets (c)   2,774,142    
Deferred income tax and social contribution   1,280    
Investments (d)   (148,748)    
Intangible assets in progress (c)   (707,817)    
Liabilities   (150,428)    
Equity   (150,428)    
Attributable to controlling shareholder's   (150,428)    
Equity valuation adjustments (e)   0    
Accumulated profit   (150,428)    
IFRS 9        
STATEMENTS OF FINANCIAL POSITION        
Assets   (14,496)    
Current assets   (18,608)    
Trade accounts receivable (a) (b)   (18,507)    
Other current receivables (a)   (101)    
Accounts receivable - concessions   0    
Contract assets (c)   0    
Noncurrent assets   4,112    
Trade accounts receivable (a)   (3,356)    
Accounts receivable related to the concession (c)   0    
Contract assets (c)   0    
Deferred income tax and social contribution   7,468    
Investments (d)   0    
Intangible assets in progress (c)   0    
Liabilities   (14,496)    
Equity   (14,496)    
Attributable to controlling shareholder's   (14,496)    
Equity valuation adjustments (e)   (4,391)    
Accumulated profit   (10,105)    
In Accordance With IFRS        
STATEMENTS OF FINANCIAL POSITION        
Assets   32,997,453    
Current assets   5,680,266    
Trade accounts receivable (a) (b)   2,711,773    
Other current receivables (a)   409,250    
Accounts receivable - concessions   83,378    
Contract assets (c)   66,366    
Noncurrent assets   27,317,187    
Trade accounts receivable (a)   257,726    
Accounts receivable related to the concession (c)   2,362,912    
Contract assets (c)   2,774,142    
Deferred income tax and social contribution   924,240    
Investments (d)   2,421,895    
Intangible assets in progress (c)   9,121,633    
Liabilities   32,997,453    
Equity   15,345,579    
Attributable to controlling shareholder's   15,042,918    
Equity valuation adjustments (e)   891,210    
Accumulated profit   R$ (160,533)