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Note 21 - Changes in Equity - Net Income Reserves (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Beginning balance R$ 47,627.4 R$ 46,651.3 R$ 50,333.7
Interest on shareholder´s equity (5,030.5) (4,869.7) (5,493.4)
Fiscal incentive reserve
Investments reserve
Final balance 57,547.4 47,627.4 46,651.3
Net income reserves, investment reserve [member]      
Statement Line Items [Line Items]      
Beginning balance 1,267.7 3,859.9  
Interest on shareholder´s equity (3,770.1)
Fiscal incentive reserve  
Investments reserve 5,442.3 1,177.9  
Final balance 6,710.0 1,267.7 3,859.9
Net income reserves, statutory reserve [member]      
Statement Line Items [Line Items]      
Beginning balance 4.5 4.5  
Interest on shareholder´s equity  
Fiscal incentive reserve  
Investments reserve  
Final balance 4.5 4.5 4.5
Net income reserves, fiscal incentive [member]      
Statement Line Items [Line Items]      
Beginning balance 7,388.0 5,835.7  
Interest on shareholder´s equity  
Fiscal incentive reserve 1,331.5 1,552.3  
Investments reserve  
Final balance 8,719.5 7,388.0 5,835.7
Net income reserves, interest on capital and dividends proposed [member]      
Statement Line Items [Line Items]      
Beginning balance 8,660.2 9,700.1  
Interest on shareholder´s equity (3,770.1)  
Fiscal incentive reserve 1,331.5 1,552.3  
Investments reserve 5,442.3 1,177.9  
Final balance R$ 15,434.0 R$ 8,660.2 R$ 9,700.1