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11. INCOME AND SOCIAL CONTRIBUTION TAXES (Details 1) - BRL (R$) R$ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax assets | R$ 4,028 | R$ 3,471 |  |
Deferred tax liabilities | (2,259) | (2,052) |  |
Total, net | 1,769 | 1,419 | R$ 1,419 | R$ 1,136
Total assets | 2,430 | 2,147 |  |
Total liabilities | (661) | (728) |  |
Tax Loss Carryforwards [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax assets | 116 | 373 |  |
Provisions For Contingencies [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax assets | 544 | 218 |  |
Impairment On Investments [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax assets | 660 | 882 |  |
Fair Value Of Derivative Financial Instruments (PUT SAAG ) [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax assets | 164 | 143 |  |
Operating Provisions [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax assets | 66 | 39 |  |
Provision For Profit Sharing [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax assets | 72 | 25 |  |
Post Employment Obligations [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax assets | 2,090 | 1,477 |  |
Estimated Provision For Doubtful Receivables [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax assets | 283 | 279 |  |
Onerous Concessions [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax assets | 8 | 8 |  |
Other [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax assets | 25 | 27 |  |
Deferred tax liabilities | (5) | (33) |  |
Funding Cost [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax liabilities | (16) | (25) |  |
Deemed Cost [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax liabilities | (232) | (239) |  |
Acquisition Costs Of Equity Interests [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax liabilities | (503) | (501) |  |
Borrowing Costs Capitalized [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax liabilities | (166) | (168) |  |
Taxes On Revenues Not Redeemed - Presumed Profit Accounting Method [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax liabilities | (1) | (5) |  |
Adjustment To Expectation Of Cash Flow Concession Assets [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax liabilities | (761) | (804) |  |
Adjustment To Fair Value: Swap/Gains [Member] |  |  |  |
Disclosure Of Income And Social Contribution Taxes Recoverable [line items] |  |  |  |
Deferred tax liabilities | R$ (575) | R$ (277) |  |

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