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Income tax and social contribution (Details 4)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
BRL (R$)
Temporary differences  
Expected realization of deferred tax assets  
Income tax R$ 26,784,302
Social contribution 16,699,485
Temporary differences | 2018  
Expected realization of deferred tax assets  
Income tax 6,189,592
Social contribution 4,778,522
Temporary differences | 2019  
Expected realization of deferred tax assets  
Income tax 6,106,611
Social contribution 3,500,573
Temporary differences | 2020  
Expected realization of deferred tax assets  
Income tax 5,444,841
Social contribution 3,163,487
Temporary differences | 2021  
Expected realization of deferred tax assets  
Income tax 4,408,140
Social contribution 2,609,808
Temporary differences | 2022  
Expected realization of deferred tax assets  
Income tax 2,534,237
Social contribution 1,470,379
Temporary differences | After 2022  
Expected realization of deferred tax assets  
Income tax 2,100,881
Social contribution 1,176,716
Income tax and Social contribution losses  
Expected realization of deferred tax assets  
Income tax 2,618,009
Social contribution 2,385,863
Income tax and Social contribution losses | 2018  
Expected realization of deferred tax assets  
Income tax 157,668
Social contribution 303,794
Income tax and Social contribution losses | 2019  
Expected realization of deferred tax assets  
Income tax 143,705
Social contribution 80,058
Income tax and Social contribution losses | 2020  
Expected realization of deferred tax assets  
Income tax 139,825
Social contribution 78,361
Income tax and Social contribution losses | 2021  
Expected realization of deferred tax assets  
Income tax 620,279
Social contribution 367,041
Income tax and Social contribution losses | 2022  
Expected realization of deferred tax assets  
Income tax 732,490
Social contribution 478,318
Income tax and Social contribution losses | After 2022  
Expected realization of deferred tax assets  
Income tax 824,042
Social contribution 1,078,291
Total  
Expected realization of deferred tax assets  
Total 48,487,659
Total | 2018  
Expected realization of deferred tax assets  
Total 11,429,576
Total | 2019  
Expected realization of deferred tax assets  
Total 9,830,947
Total | 2020  
Expected realization of deferred tax assets  
Total 8,826,514
Total | 2021  
Expected realization of deferred tax assets  
Total 8,005,268
Total | 2022  
Expected realization of deferred tax assets  
Total 5,215,424
Total | After 2022  
Expected realization of deferred tax assets  
Total R$ 5,179,930