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21. Employees benefits (Details 2) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employees Benefits Details 2Abstract      
Defined benefit obligation, beginning of the year R$ 2,532,338 R$ 2,319,841 R$ 2,465,721
Current service cost   13,905 17,582
Interest cost R$ 224,429 213,201 260,409
Actuarial (gains)/losses recorded as other comprehensive income   114,188 (305,511)
Benefits paid   (128,797) (118,360)
Defined benefit obligation, end of the year   R$ 2,532,338 R$ 2,319,841