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Note 21 - Changes in Equity - Interest on Shareholders' Equity/Dividends (Details) - BRL (R$)
R$ / shares in Units, R$ in Millions
 12 Months Ended
Feb. 22, 2018
Dec. 28, 2017
Jul. 17, 2017
Feb. 23, 2017
Dec. 29, 2016
Nov. 25, 2016
Jul. 29, 2016
Feb. 29, 2016
Dec. 30, 2015
Sep. 28, 2015
Jun. 29, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]                              
Amount per share, dividends (in BRL per share)     R$ 0.16 R$ 0.07   R$ 0.16 R$ 0.13     R$ 0.15          
Total amount of dividends     R$ 2,513.1 R$ 1,099.1   R$ 2,511.9 R$ 2,040.8     R$ 2,352.4          
Amount per share, interest on shareholder´s equity (in BRL per share)   R$ 0.31     R$ 0.22     R$ 0.13 R$ 0.15   R$ 0.10        
Dividends recognised as distributions to owners   R$ 4,869.7 [1]     R$ 3,454.2     R$ 2,039.2 [2] R$ 2,352.7   R$ 1,570.6   R$ 4,044.0 R$ 6,007.3 R$ 2,612.8
Total amount of dividends and interest on shareholder´s equity                         R$ 8,482.5 R$ 11,145.2 R$ 7,690.2
Potential ordinary share transactions [member]                              
Statement Line Items [Line Items]                              
Amount per share, dividends (in BRL per share) R$ 0.07                            
Total amount of dividends R$ 1,099.7                            
Dividends 1 [member]                              
Statement Line Items [Line Items]                              
Amount per share, interest on shareholder´s equity (in BRL per share)                       R$ 0.03      
Dividends recognised as distributions to owners [2]                       R$ 471.5      
Dividends 2 [member]                              
Statement Line Items [Line Items]                              
Amount per share, interest on shareholder´s equity (in BRL per share)                       R$ 0.06      
Dividends recognised as distributions to owners                       R$ 943.0      
[1] R$3,770.1 of these interest on shareholder's equity refer to the total amount approved for distribution in the period, and were accrued in investments reserves.
[2] These dividends refer to the total amount approved for distribution in the period, and were accrued in investments reserves.