XML 141 R120.htm IDEA: XBRL DOCUMENT v3.21.1
15. CONCESSION CONTRACT ASSETS (Details Narrative) - BRL (R$)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Borrowing costs capitalised R$ 34    
Impairment on assets 14 R$ 22  
Contract assets R$ 4,980    
Periodic Tariff Revision of Permitted Annual Revenue   9.13%  
Increase in revenues 13.15%    
NET REVENUE R$ 25,228 R$ 25,487 [1] R$ 22,266
Assets 54,083 R$ 50,526 [1] R$ 59,855
Basic Network of the Existing System (BNES) [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Assets R$ 207    
Percentage of changes in the asset base 7.00%    
Percentage of account write-offs and assets 38.00%    
Basic Network of New Facilities (BNNF) [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Assets R$ 321    
Net of PIS/Pasep and Cofins taxes 502    
contract 006/1997 [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
NET REVENUE R$ 528    
Amounts reclassified R$ 1,296 R$ 1,281  
contract 079/2020 [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
NET REVENUE R$ 23    
Repositioning factor 57.50%    
Commercial operation R$ 24    
contract 079/2020 [member] | Bottom Of Range [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Weighted average cost of capital after tax 6.64%    
contract 079/2020 [member] | Top of Range [member]      
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]      
Weighted average cost of capital after tax 7.71%    
[1] See note 2.8.