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Schedule of changes in intangible assets (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
IfrsStatementLineItems [Line Items]      
Intangible assets R$ 11,810 R$ 11,624 R$ 10,777
Intangible assets 1,032 41 934
Disposals and retirements, intangible assets other than goodwill (23) (24) (41)
Amortisation, intangible assets other than goodwill (829) (744) (704)
Increase (decrease) through transfers and other changes, intangible assets other than goodwill 915 913 658
Intangible assets 12,953 11,810 11,624
Temporary Easements Intangible Assets [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets 9 8 9
Intangible assets    
Disposals and retirements, intangible assets other than goodwill 0    
Amortisation, intangible assets other than goodwill (1) (1)  
Increase (decrease) through transfers and other changes, intangible assets other than goodwill 2 1  
Intangible assets 10 9 8
Onerous Concession Intangible Assets [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets 6 7 7
Intangible assets 0    
Disposals and retirements, intangible assets other than goodwill 0    
Amortisation, intangible assets other than goodwill (1) (1)  
Increase (decrease) through transfers and other changes, intangible assets other than goodwill 0    
Intangible assets 5 6 7
Assets Of Concession Intangible Assets [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets 11,674 11,517 10,680
Intangible assets 0   891
Disposals and retirements, intangible assets other than goodwill (23) (24) (41)
Amortisation, intangible assets other than goodwill (757) (738) (698)
Increase (decrease) through transfers and other changes, intangible assets other than goodwill 913 919 685
Intangible assets 11,807 11,674 11,517
Assets Of Concession G S F Intangible Assets [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets    
Intangible assets 1,032    
Disposals and retirements, intangible assets other than goodwill 0    
Amortisation, intangible assets other than goodwill (66)    
Increase (decrease) through transfers and other changes, intangible assets other than goodwill 0    
Intangible assets 966  
Others Intangible Assets [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets 8 10 18
Intangible assets 0   7
Disposals and retirements, intangible assets other than goodwill 0    
Amortisation, intangible assets other than goodwill (4) (5) (5)
Increase (decrease) through transfers and other changes, intangible assets other than goodwill 0 3 (10)
Intangible assets 4 8 10
In Progress [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets 113    
Intangible assets 51    
Disposals and retirements, intangible assets other than goodwill 0    
Amortisation, intangible assets other than goodwill    
Increase (decrease) through transfers and other changes, intangible assets other than goodwill (3)    
Intangible assets 161 113  
Net Intangible Assets [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets 11,810    
Intangible assets 1,083    
Disposals and retirements, intangible assets other than goodwill (23)    
Amortisation, intangible assets other than goodwill (829)    
Increase (decrease) through transfers and other changes, intangible assets other than goodwill 912    
Intangible assets 12,953 11,810  
Useful Life Defined Intangible Asset [Member]      
IfrsStatementLineItems [Line Items]      
Intangible assets 11,697 11,542 10,714
Intangible assets     898
Disposals and retirements, intangible assets other than goodwill   (24) (41)
Amortisation, intangible assets other than goodwill   (744) (704)
Increase (decrease) through transfers and other changes, intangible assets other than goodwill   923 675
Intangible assets 12,792 11,697 11,542
Intangible assets under development [member]      
IfrsStatementLineItems [Line Items]      
Intangible assets 113 82 63
Intangible assets   41 36
Increase (decrease) through transfers and other changes, intangible assets other than goodwill   (10) (17)
Intangible assets R$ 161 R$ 113 R$ 82