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Other operating income/(expenses) (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other operating income/(expenses) [Abstract]      
Tax expenses R$ (5,960,618) R$ (6,331,651) R$ (4,791,754)
Legal provision (1,238,057) (2,927,734) (1,439,460)
Variation in monetary liabilities 31,710 (699,719) (597,240)
Income from sales of non-current assets, investments, and property and equipment, net (412,957) (467,042) (277,232)
Other [1] (2,553,435) (3,578,016) (5,882,867)
Total R$ (10,133,357) R$ (14,004,162) R$ (12,988,553)
[1] Includes: (i) the effect of the (additions)/reversal of provision for tax contingency in 2017 - R$ 487,269 thousand (2016 - R$ (484,227) thousand and 2015 - R$ (570,835) thousand); (ii) impairment losses in the amount of 2017 - R$ 185,188 thousand (2016 - R$ 31,256 thousand and 2015 - R$ 207,880 thousand); and (iii) operating expense related of insurance operation in 2017 - R$ 1,354,719 thousand (2016 - R$ 1,388,645 thousand and 2015 - R$ 1,281,381 thousand).