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30. OPERATING COSTS AND EXPENSES (Details 3) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Operating Provisions Reversals [line items]      
Estimated losses on doubtful accounts receivables R$ 238 R$ 264 R$ 248
Estimated losses on other accounts receivables [1] 11 (4) 27
Estimated losses on accounts receivables from related parties [2] 688    
Contingency provisions (reversals)      
Labor claims [3] 136 42 206
Civil [3] 24 13 27
Tax [3] 1,228 (5) 7
Environmental [3] (1) 1  
Regulatory [3] 1 (2) (3)
Other [3] 12 2 (6)
Other provisions [3] 1,400 51 231
Operating provision (Reversals) [3] 2,337 311 506
Adjustment for losses      
Provision for losses 64 155 348
Operating provision (reversals) and adjustment for losses , Total 2,401 466 854
Written Put Options [Member] | RME and LEPSA [member]      
Adjustment for losses      
Provision for losses 48 231
Written Put Options [Member] | S A A G lnvestimentos S A [member]      
Adjustment for losses      
Provision for losses 64 R$ 107 116
Written Put Options [Member] | Sonda Procwork Outsourcing Informatica ltda [Member]      
Adjustment for losses      
Provision for losses   R$ 1
[1] The estimated losses on other accounts receivable are presented in the consolidated Statement of income as operating expenses.
[2] Estimated losses on accounts receivable from Renova, as a result of the assessment of the jointly-controlled entity credit risk, which deteriorated in the current year.
[3] The provisions for contingencies of the holding company are presented in the consolidated statement of income for the year as operating expenses.