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21 Employees benefits (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Summary of employee benefits [Line Items]    
Defined benefit obligation, beginning R$ (6,113,349) R$ (5,138,445)
Current service cost (40,404) (274,368)
Interest cost (414,747) (224,429)
Actuarial (gains)/losses recorded as other comprehensive income 585,968 (790,473)
Benefits paid 320,011 314,366
Defined benefit obligation, ending (5,662,521) (6,113,349)
G1 Plan [member]    
Summary of employee benefits [Line Items]    
Defined benefit obligation, beginning (3,067,094) (2,532,338)
Current service cost (40,404) (47,001)
Interest cost (208,485) (224,429)
Actuarial (gains)/losses recorded as other comprehensive income 64,637 (392,876)
Benefits paid 138,366 129,550
Defined benefit obligation, ending (3,112,980) (3,067,094)
G0 plan [member]    
Summary of employee benefits [Line Items]    
Defined benefit obligation, beginning (3,046,255) (2,606,107)
Current service cost 0 (227,367)
Interest cost (206,262) 0
Actuarial (gains)/losses recorded as other comprehensive income 521,331 (397,597)
Benefits paid 181,645 184,816
Defined benefit obligation, ending R$ (2,549,541) R$ (3,046,255)