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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
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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

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