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32. Operating Costs and Expenses (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfEstimatedLossesProvisionsAndReversalsLineItems [Line Items]      
Estimated losses, provisions and reversals R$ 306,697 R$ 365,539 R$ 768,696
Provision (reversal) for litigations      
DisclosureOfEstimatedLossesProvisionsAndReversalsLineItems [Line Items]      
Estimated losses, provisions and reversals 219,636 386,373 (21,408)
Accounts receivable related to the concession compensation      
DisclosureOfEstimatedLossesProvisionsAndReversalsLineItems [Line Items]      
Estimated losses, provisions and reversals (4,758) (1,117) 75
Credits on sales and purchases of gas      
DisclosureOfEstimatedLossesProvisionsAndReversalsLineItems [Line Items]      
Estimated losses, provisions and reversals 0 (123,586) 87,479
Property, plant and equipment      
DisclosureOfEstimatedLossesProvisionsAndReversalsLineItems [Line Items]      
Estimated losses, provisions and reversals (14,162) 1,921 494,023
Allowance for doubtful accounts (Client and Other credits)      
DisclosureOfEstimatedLossesProvisionsAndReversalsLineItems [Line Items]      
Estimated losses, provisions and reversals 96,202 90,589 179,908
Tax credits estimated losses      
DisclosureOfEstimatedLossesProvisionsAndReversalsLineItems [Line Items]      
Estimated losses, provisions and reversals R$ 9,779 11,470 23,917
Estimated losses (reversion) in consortiums      
DisclosureOfEstimatedLossesProvisionsAndReversalsLineItems [Line Items]      
Estimated losses, provisions and reversals   R$ (111) R$ 4,702