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Schedule of exposure to exchange rates (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Assets    
Cash equivalents – Cash investments (Note 6) – CDI R$ 708 R$ 1,587
Marketable securities (Note 7) 2,078 4,125
Restricted cash – CDI 19 64
CVA and in tariffs (Note 14) – SELIC 2,148 133
 Assets 4,953 5,909
Liabilities    
Loans, financing and debentures (Note 22) – CDI (1,458) (2,310)
Loans, financing and debentures (Note 22) – TJLP (21) (73)
Sector financial liabilities (note 14) (51) (231)
 Total liabilities (1,530) (2,614)
Net assets exposed 3,423 3,295
Cash equivalents (Note 6) 708  
Restricted cash 19  
CVA and Other financial components – SELIC (Note 14) 2,148 R$ 4,058
 Assets 4,953  
Loans and financing (Note 22) – CDI (1,458)  
Loans and financing (Note 22) – TJLP (21)  
Sector financial liabilities (Note 14) (51)  
 Liabilities (1,530)  
Net assets (liabilities) exposed 3,423  
Probable Ccenario [Member] | T J L P [Member]    
Assets    
Marketable securities (Note 7) 2,348  
Liabilities    
Cash equivalents (Note 6) 800  
Restricted cash 21  
CVA and Other financial components – SELIC (Note 14) 2,427  
 Assets 5,596  
Loans and financing (Note 22) – CDI (1,648)  
Loans and financing (Note 22) – TJLP (22)  
Sector financial liabilities (Note 14) (55)  
 Liabilities (1,725)  
Net assets (liabilities) exposed 3,871  
Net effect of fluctuation in interest rates 448  
Probable Ccenario [Member] | T J L P One [Member]    
Assets    
Marketable securities (Note 7) 2,281  
Liabilities    
Cash equivalents (Note 6) 777  
Restricted cash 21  
CVA and Other financial components – SELIC (Note 14) 2,357  
 Assets 5,436  
Loans and financing (Note 22) – CDI (1,600)  
Loans and financing (Note 22) – TJLP (22)  
Sector financial liabilities (Note 14) (54)  
 Liabilities (1,676)  
Net assets (liabilities) exposed 3,760  
Net effect of fluctuation in interest rates 337  
Probable Ccenario [Member] | T J L P Three [Member]    
Assets    
Marketable securities (Note 7) 2,213  
Liabilities    
Cash equivalents (Note 6) 754  
Restricted cash 20  
CVA and Other financial components – SELIC (Note 14) 2,288  
 Assets 5,275  
Loans and financing (Note 22) – CDI (1,553)  
Loans and financing (Note 22) – TJLP (22)  
Sector financial liabilities (Note 14) (53)  
 Liabilities (1,628)  
Net assets (liabilities) exposed 3,647  
Net effect of fluctuation in interest rates R$ 224