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Schedule of deferred income and social contribution taxes (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesAssets-0] | R$ 4,255 | R$ 4,323 | R$ 4,028
[custom:DeferredIncomeAndSocialContributionTaxesLiabilities] | 1,503 | 1,413 | 1,660
[custom:DeferredIncomeAndSocialContributionTaxesLiabilities1] | (2,752) | (2,910) | (2,368)
[custom:DeferredIncomeTaxAssetsAndSocialContributionTaxNoncurrent-0] | 2,465 | 2,453 | 2,430
[custom:NoncurrentPayablesOnSocialSecurityAndTaxes-0] | (962) | (1,040) | (770)
Tax Loss Carryforward [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesAssets-0] | 807 | 401 | 116
Provisions For Contingencies [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesAssets-0] | 542 | 538 | 544
Impairment On Investments [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesAssets-0] | 244 | 640 | 660
Provision P U T S A A G [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesAssets-0] | 216 | 182 | 164
Post Employment Obligations [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesAssets-0] | 1,981 | 2,168 | 2,090
Provision For Doubtful Trade Receivable [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesAssets-0] | 315 | 256 | 283
Other Deferred Income And Social Contribution Taxes Assets [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesAssets-0] | 150 | 138 | 171
[custom:DeferredIncomeAndSocialContributionTaxesLiabilities] | (24) | (12) | (16)
Deemed Cost [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesLiabilities] | (219) | (225) | (232)
Cost Of Acquisition Of Equity Interests [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesLiabilities] | (466) | (486) | (503)
Borrowing Costs Capitalized [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesLiabilities] | (165) | (169) | (166)
Adjustment Of Expectation Of Cash Flow Concession Assets [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesLiabilities] | (245) | (242) | (247)
Revenues Arising From Transmission Contract Asset [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesLiabilities] | (895) | (768) | (624)
Adjustment To Fair Value Swap Gains [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesLiabilities] | (412) | (1,002) | (575)
Updating On Escrow Deposits [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesLiabilities] | (7) | R$ (6) | R$ (5)
Reimbursement Of Costs G S F [Member] |  |  |
IfrsStatementLineItems [Line Items] |  |  |
[custom:DeferredIncomeAndSocialContributionTaxesLiabilities] | R$ (319) |  |

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