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Income tax and social contribution (Details 2) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current Taxes [Abstract]      
Income tax and social contribution payable R$ (8,788,060) R$ (8,852,947) R$ (6,075,948)
Deferred taxes:      
Net Addition/(realization) of temporary differences 2,950,961 (4,106,008) 11,424,595
Use of opening balances of:      
Social contribution loss (430,584) (647,282) (127,214)
Income tax loss (331,512) (879,276) (65,224)
Addition on:      
Social contribution loss 150,371 234,730 272,793
Income tax loss 19,868 338,053 731,419
Activation of the tax credit - Law No. 13,169/15:      
Social contribution loss     422,853
Temporary additions     2,051,048
Total deferred tax expense 2,359,104 (5,059,783) 14,710,270
Income tax and social contribution R$ (6,428,956) R$ (13,912,730) R$ 8,634,322