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Loans, Financings and Debentures - Summary of Changes in Loans, Financings and Debentures (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]      
Beginning Balance R$ 14,398    
Ending Balance 14,772 R$ 14,398  
Loans, financing and debentures [member]      
Disclosure of detailed information about borrowings [line items]      
Beginning Balance 14,398 15,179 R$ 15,167
Liabilities arising from business combination (3) 163    
Initial balance for consolidation purposes 14,561    
Loans and financings obtained 2,996 3,363 5,878
Transaction costs   (11) (141)
Transaction costs (16) (16)  
Interest paid in advance 10 (48)  
Financings obtained, net 2,990 3,299 5,737
Monetary and exchange rate variation     231
Monetary variation 134 109  
Exchange rate variation 582 59  
Financial charges provisioned 1,287 1,537 2,002
Amortization of transaction cost 33 67 68
Financial charges paid (1,290) (1,749) (2,369)
Amortization of financings (3,527) (4,131) (5,592)
Subtotal 14,770 14,359 15,244
(-) FIC Pampulha: Marketable securities of subsidiary companie 2 39 (65)
Ending Balance R$ 14,772 R$ 14,398 R$ 15,179