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3 Basis of Preparation (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
BasisOfPreparationDetailsLineItems [Line Items]      
ASSETS R$ 46,784,664    
CURRENT ASSETS 11,407,431    
Accounts receivable - concessions 4,515    
Contract assets 285,682    
NONCURRENT ASSETS 35,377,233    
Accounts receivable - concessions 1,897,825    
Contract assets R$ 5,207,115    
As previously stated [member]      
BasisOfPreparationDetailsLineItems [Line Items]      
ASSETS   R$ 38,312,550 R$ 36,048,122 [1]
CURRENT ASSETS   7,909,196 6,677,846 [1]
Accounts receivable - concessions   58,842 53,177 [1]
Contract assets   107,443 85,019 [1]
NONCURRENT ASSETS   30,403,354 29,370,276 [1]
Accounts receivable - concessions   2,558,796 2,497,514 [1]
Contract assets   3,943,941 3,348,211 [1]
Adjustments [member]      
BasisOfPreparationDetailsLineItems [Line Items]      
ASSETS  
CURRENT ASSETS  
Accounts receivable - concessions   (54,297) (48,997)
Contract assets   54,297 48,997
NONCURRENT ASSETS  
Accounts receivable - concessions   (684,972) (704,829)
Contract assets   684,972 704,829
Restated [Member]      
BasisOfPreparationDetailsLineItems [Line Items]      
ASSETS   38,312,550 36,048,122
CURRENT ASSETS   7,909,196 6,677,846
Accounts receivable - concessions   4,545 4,180
Contract assets   161,740 134,016
NONCURRENT ASSETS   30,403,354 29,370,276
Accounts receivable - concessions   1,873,824 1,792,685
Contract assets   R$ 4,628,913 R$ 4,053,040
[1] The balance considers the adjustments of 01.01.2019 resulting from the initial application of IFRS 16, as shown in Note 4.16 of the Consolidated Financial Statements of December 31, 2019.