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21 Employees benefits (Details 4) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of employee benefits [Line Items]      
Cost of service, net R$ 4,608 R$ 235,976 R$ 209,817
Interest cost rates 414,747 224,429 213,201
Expected return on the plan's assets (187,317) (192,965) (179,449)
Amount received from State of Sao Paulo (undisputed) (95,452) (97,300) (96,282)
Total expenses 136,586 170,140 147,287
G1 Plan [member]      
Summary of employee benefits [Line Items]      
Cost of service, net 4,608 8,609 (22,431)
Interest cost rates 208,485 224,429 213,201
Expected return on the plan's assets (187,317) (192,965) (179,449)
Amount received from State of Sao Paulo (undisputed) 0 0 0
Total expenses 25,776 40,073 11,321
G0 plan [member]      
Summary of employee benefits [Line Items]      
Cost of service, net 0 227,367 232,248
Interest cost rates 206,262 0 0
Expected return on the plan's assets 0 0 0
Amount received from State of Sao Paulo (undisputed) (95,452) (97,300) (96,282)
Total expenses R$ 110,810 R$ 130,067 R$ 135,966