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Concession Financial Assets and Liabilities - Summary of Changes in Balances of Financial Assets and Liabilities (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Financial Assets And Financial Liabilities With The Tariff Adjustments [Abstract] |  |  |
Beginning balance | R$ (407) | R$ 1,350 | R$ 1,107
Net constitution of financial liabilities |  | (858) |
Additions | 811 |  | 2,285
Amortization | 177 | (597) | (581)
Receipt of funds from the ACR Account and from the Centralizing Account for Funds from the Tariff Flag System-CCRBT |  |  | (1,529)
Payments from the Flag Tariff Centralizing Account | (586) | (341) |
Transfer |  | (165) |
Updating - Selic rate | (41) | 204 | 68
Ending balance | R$ (46) | R$ (407) | R$ 1,350

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