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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about borrowings [line items]      
Beginning Balance R$ 15,179    
Financings obtained net of funding costs 4,812    
Ending Balance 14,398 R$ 15,179  
Loans, financings and debentures [member]      
Disclosure of detailed information about borrowings [line items]      
Beginning Balance 15,179 15,167 R$ 13,509
Loans and financings obtained 3,363 5,878 5,817
Funding costs     (78)
Transaction costs (16) (141)  
Financings obtained net of funding costs     5,739
Interest paid in advance (1) (48)    
Financings obtained, net 3,299 5,737  
Transaction costs (2) (11)    
Monetary and exchange rate variation 168 231 400
Financial charges provisioned 1,537 2,002 1,529
Amortization of transaction cost 67 68 16
Financial charges paid (1,749) (2,369) (1,331)
Amortization of financings (4,131) (5,592) (4,695)
Subtotal 14,359 15,244  
(-) FIC Pampulha: Securities of subsidiary companies 39 (65)  
Ending Balance R$ 14,398 R$ 15,179 R$ 15,167