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Finance Income and Expenses - Summary of Financial Income and Expenses (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
FINANCE INCOME      
Income from financial investments R$ 116 R$ 205 R$ 317
Interest on sale of energy 352 261 277
Foreign exchange variations   19 62
Monetary variations 19 46 106
Monetary variations - CVA (Note 15) 62   204
Monetary updating of escrow deposits 34 191 46
Pasep and Cofins charged on finance income (2) (68) (53) (88)
Gains on financial instruments - swap (Note 32) 893    
Finance income from advance payments 29    
Inflation adjustment in arbitration case (1) (Note 17) 77    
Borrowing costs paid by related parties (Note 31) 56    
Other 136 135 117
Finance income 1,706 804 1,041
FINANCE EXPENSES      
Charges on loans and financings (1,257) (1,466) (1,860)
Cost of debt - amortization of transaction cost (Note 22) (33) (67) (68)
Foreign exchange variations - loans and financing (Note 22) (582) (73) (35)
Foreign exchange variations - Itaipu (29)    
Monetary updating - loans and financings (Note 22) (134) (109) (245)
Monetary updating - onerous concessions (3)   (3)
Charges and monetary updating on post-employment obligations (Note 24) (68) (65) (103)
Losses on financial instruments (Note 32)   (32)  
Monetary updating - CCEE obligations     (10)
Monetary updating - CVA   (41)  
Monetary updating - AFAC   239  
Monetary updating - Advance sales of energy supply (Note 8) (11) (45)  
Adjustment to present value   (2)  
Other (107) (139) (154)
Finance costs (2,224) (1,800) (2,478)
NET FINANCE INCOME (EXPENSES) R$ (518) R$ (996) R$ (1,437)