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Note 9 - Payroll and Related Benefits - Schedule of Payroll and Related Benefits (Details) - BRL (R$)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Wages and salaries R$ 3,422,000,000 R$ 3,371,200,000 R$ 3,038,900,000
Social security contributions 789,300,000 741,100,000 727,200,000
Other personnel cost 726,600,000 616,200,000 613,800,000
Increase in liabilities for defined benefit plans 142,000,000 138,700,000 151,700,000
Share-based payment 162,700,000 236,900,000 189,300,000
Contributions to defined contribution plans 32,200,000 18,900,000 25,300,000
Total R$ 5,274,800,000 R$ 5,123,000,000 R$ 4,746,200,000