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Operating Costs And Expenses - Summary of Operating Provisions (Reversals) (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating provisions reversals [line items]      
Estimated losses on doubtful accounts receivables (Note 8) R$ 264 R$ 248 R$ 382
Estimated losses on other accounts receivables (4) 27 40
Contingency provisions (reversals) (Note 25) 0 0 0
Labor claims 42 206 120
Civil 13 27 30
Tax (5) 7 2
Environmental 1    
Regulatory (2) (3)  
Other 2 (6) 31
Other provisions 51 231 183
Operating provision (Reversals) 311 506 605
Adjustment for losses      
Provision for losses 155 348 99
Operating provision (reversals) and adjustment for losses , Total 466 854 704
Put option [Member] | Sonda [Member]      
Adjustment for losses      
Provision for losses   1 (5)
Put option [Member] | RME and LEPSA [member]      
Adjustment for losses      
Provision for losses 48 231 55
Put option [Member] | SAAG [Member]      
Adjustment for losses      
Provision for losses R$ 107 R$ 116 R$ 49