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Schedule of changes in investments in subsidiaries jointly controlled entities and affiliates (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | R$ 5,385 | R$ 5,378 | R$ 5,235
Gain (loss) by equity method (Income statement) | 182 | 357 | 125
Dividends | (654) | (399) | (284)
Ending balance | 4,923 | 5,385 | 5,378
Other | (6) | 13 | 1
Additions / acquisitions | 56 | 119 | 33
Losses on investments | (40) |  |
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) |  | 37 | 268
Disposals |  | (120) |
Hidreletrica cachoeirao [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 53 | 54 | 49
Gain (loss) by equity method (Income statement) | 14 | 9 | 11
Dividends | (8) | (10) | (6)
Ending balance | 59 | 53 | 54
Guanhaes Energia [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 131 | 131 |
Gain (loss) by equity method (Income statement) | (6) |  |
Ending balance | 125 | 131 | 131
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) |  |  | 131
Hidreletrica Pipoca [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 36 | 31 | 31
Gain (loss) by equity method (Income statement) | 11 | 11 | 4
Dividends |  | (6) | (4)
Ending balance | 47 | 36 | 31
Madeira Energia 1 [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 209 |  |
Gain (loss) by equity method (Income statement) | (209) |  |
Ending balance |  | 209 |
F I P Melbournes [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 158 |  |
Gain (loss) by equity method (Income statement) | (158) |  |
Ending balance |  | 158 |
Lightger [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 131 | 128 |
Gain (loss) by equity method (Income statement) | 5 | 10 |
Dividends | (12) | (7) |
Ending balance | 124 | 131 | 128
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) |  |  | 128
Baguari Energia [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 159 | 157 | 162
Gain (loss) by equity method (Income statement) | 31 | 23 | 22
Dividends | (22) | (21) | (27)
Ending balance | 168 | 159 | 157
Amazonia Energia [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 965 | 1,028 | 1,013
Gain (loss) by equity method (Income statement) | (32) | (63) | 15
Ending balance | 933 | 965 | 1,028
Additions / acquisitions | 2 |  |
Alianca norte [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 631 | 671 | 664
Gain (loss) by equity method (Income statement) | (22) | (40) | 6
Ending balance | 609 | 631 | 671
Additions / acquisitions |  |  | 1
Ativas data center [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 17 | 16 | 16
Gain (loss) by equity method (Income statement) | (1) | 1 |
Ending balance | 16 | 17 | 16
Taesa [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 1,467 | 1,213 | 1,143
Gain (loss) by equity method (Income statement) | 481 | 494 | 210
Dividends | (368) | (240) | (141)
Ending balance | 1,580 | 1,467 | 1,213
Other |  |  | 1
Alianca geracao [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 1,167 | 1,192 | 1,217
Gain (loss) by equity method (Income statement) | 199 | 89 | 78
Dividends | (225) | (114) | (103)
Ending balance | 1,141 | 1,167 | 1,192
Retiro baixo [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 195 | 180 | 171
Gain (loss) by equity method (Income statement) | 13 | 15 | 12
Dividends | (7) |  | (3)
Ending balance | 201 | 195 | 180
UFV Janauba Geracao de Energia Eletrica Distribuida [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 10 | 10 | 9
Gain (loss) by equity method (Income statement) | 1 | 1 | 1
Dividends | (2) | (1) |
Ending balance | 3 | 10 | 10
Other | (6) |  |
U F V Corinto Geracao De Energia Eletrica Distriiuida [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 10 |  |
Gain (loss) by equity method (Income statement) |  | 1 |
Dividends | (1) |  |
Ending balance | 9 | 10 |
Additions / acquisitions |  | 9 |
U F V Manga Geracao De Energia Eletrica Distribuida [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 11 |  |
Gain (loss) by equity method (Income statement) | 2 | 1 |
Dividends | (2) |  |
Ending balance | 11 | 11 |
Additions / acquisitions |  | 10 |
U F V Bonfinopolis I I Geracao De Energia Eletrica Distribuida [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 6 |  |
Ending balance | 6 | 6 |
Additions / acquisitions |  | 6 |
U F V Lagoa Grande Geracao De Energia Eletrica Distribuida [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 15 |  |
Gain (loss) by equity method (Income statement) | 2 | 3 |
Dividends | (2) |  |
Ending balance | 15 | 15 |
Additions / acquisitions |  | 12 |
U F V Lontra Geracao De Energia Eletrica Distribuida [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 17 |  |
Gain (loss) by equity method (Income statement) | 1 | 3 |
Ending balance | 18 | 17 |
Additions / acquisitions |  | 14 |
U F V Mato Verde Geracao De Energia Eletrica Distribuida [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 6 |  |
Gain (loss) by equity method (Income statement) | 1 |  |
Dividends | (1) |  |
Ending balance | 6 | 6 |
U F V Mirabela Geracao De Energia Eletrica Distribuida [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 4 |  |
Gain (loss) by equity method (Income statement) | 1 |  |
Dividends | (1) |  |
Ending balance | 4 | 4 |
Other |  | (1) |
Additions / acquisitions |  | 5 |
U F V Porteirinha I Geracao De Energia Eletrica Distribuida [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 6 |  |
Dividends | (1) |  |
Ending balance | 5 | 6 |
Additions / acquisitions |  | 6 |
U F V Porteirinha I I Geracao De Energia Eletrica Distribuida [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 7 |  |
Gain (loss) by equity method (Income statement) | 1 | 1 |
Dividends | (1) |  |
Ending balance | 7 | 7 |
Additions / acquisitions |  | 6 |
U F V Brasilandia Geracao De Energia Eletrica Distribuida [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance |  |  |
Gain (loss) by equity method (Income statement) | 4 |  |
Dividends | (1) |  |
Ending balance | 15 |  |
Additions / acquisitions | 12 |  |
Axxiom Solucoes Tecnologicas [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 4 | 13 |
Gain (loss) by equity method (Income statement) | (2) | (9) |
Ending balance | 4 | 4 | 13
Additions / acquisitions |  |  | 9
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) |  |  | 4
Investments Property [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 5,415 | 5,400 | 5,235
Gain (loss) by equity method (Income statement) | 337 | 366 | 125
Dividends | (654) | (399) | (284)
Ending balance | 5,106 | 5,415 | 5,400
Other | (6) | 13 | 23
Additions / acquisitions | 14 | 118 | 33
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) |  | 37 | 268
Disposals |  | (120) |
Itaocara Provision For Losses [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | (30) | (22) |
Gain (loss) by equity method (Income statement) | 7 |  |
Ending balance | (21) | (30) | (22)
Other |  |  | (22)
Additions / acquisitions | 42 |  |
Losses on investments | (40) |  |
Madeira energia [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 209 | 167 | 270
Gain (loss) by equity method (Income statement) | (162) | 42 | (103)
Ending balance | (162) | 209 | 167
Companhia De Transmissao Centroeste De Minas [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance |  | 24 | 20
Gain (loss) by equity method (Income statement) |  |  | 4
Dividends |  |  |
Ending balance |  |  | 24
Other |  | 14 |
Additions / acquisitions |  | 45 |
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) |  | 37 |
Disposals |  | (120) |
Fip melbourne [member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 158 | 385 | 470
Gain (loss) by equity method (Income statement) |  | (227) | (85)
Ending balance |  | 158 | 385
U F V Mato Verde Geracao De Energia Eletrica Distribuida Membe [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | 6 |  |
Gain (loss) by equity method (Income statement) |  | 1 |
Ending balance |  | 6 |
Additions / acquisitions |  | 5 |
Usina Hidreletrica Itaocara S A [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
Beginning balance | R$ (30) | (22) |
Gain (loss) by equity method (Income statement) |  | (9) | (50)
Ending balance |  | (30) | (22)
Other |  |  | 22
Additions / acquisitions |  | R$ 1 | 23
Remeasurement of previously held equity interest in subsidiaries acquired (step- acquisition) |  |  | R$ 5

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