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Note 23 - Employee Benefits - Plan Assets (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
Balance R$ 2,252.3 R$ 2,104.2  
Administrative costs 3.8 3.4 R$ 3.7
Expected Return excluding interest income 99.0 208.5  
Curtailments, settlements and others (7.3) (4.2) (0.7)
Balance 2,279.3 2,252.3 2,104.2
Plan assets [member]      
Statement Line Items [Line Items]      
Balance 4,006.2 3,845.2 3,781.4
Interest Income 267.8 273.3 274.7
Administrative costs (3.8) (3.4) (3.7)
Expected Return excluding interest income (168.8) (64.8) 269.8
Acquisition through business combination 73.5
Contributions by employer 213.3 183.2 175.9
Contributions by plan participants 4.7 4.5 5.6
Exchange differences 170.6 166.8 (315.3)
Curtailments, settlements and others (8.0)
Benefits paid excluding costs of administration (422.4) (398.6) (416.7)
Balance R$ 4,059.6 R$ 4,006.2 R$ 3,845.2