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Note 21 - Changes in Equity - Capital Stock (Details) - BRL (R$)
shares in Millions, R$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Beginning balance R$ 47,627.4 R$ 46,651.3
Share issued, amount 103.1  
Final balance R$ 57,547.4 R$ 47,627.4
Issued capital [member]    
Statement Line Items [Line Items]    
Beginning balance, common shares (in shares) 15,717.6 15,717.6
Beginning balance R$ 57,614.1 R$ 57,614.1
Share issued, common shares (in shares) 4.5
Share issued, amount R$ 96.1
Final balance, common shares (in shares) 15,722.1 15,717.6
Final balance R$ 57,710.2 R$ 57,614.1