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Note 12 - Income Tax and Social Contribution - Income Taxes Reported (Details) - BRL (R$)
R$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Income tax expense - current R$ (5,332.3) R$ (413.9) R$ (1,227.8)
Deferred tax expense on temporary differences 891.9 (732.5) (2,192.4)
Deferred tax over taxes losses carryforwards movements in the current period (638.9) 831.4 (214.0)
Total deferred tax (expense)/income 253.0 98.9 (2,406.4)
Total income tax expenses R$ (5,079.3) R$ (315.0) R$ (3,634.2)