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15 Intangible assets (Details 3) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary of intangible assets [Line Items]    
Right of use R$ 589,130 R$ 640,415
Leases related to contract assets [member]    
Summary of intangible assets [Line Items]    
Right of use 276,893 276,893
Leases related to concession agreements and program contracts [member]    
Summary of intangible assets [Line Items]    
Right of use 269,561 292,824
Leases related to concession agreements and program contracts [member] | Cost [member]    
Summary of intangible assets [Line Items]    
Right of use 405,426 405,426
Leases related to concession agreements and program contracts [member] | Accumulated amortization [member]    
Summary of intangible assets [Line Items]    
Right of use (135,865) (112,602)
Other assets [member]    
Summary of intangible assets [Line Items]    
Right of use 42,676 70,698
Vehicles [member]    
Summary of intangible assets [Line Items]    
Right of use 115,208 91,709
Properties [member]    
Summary of intangible assets [Line Items]    
Right of use 15,508 13,309
Equipment [member]    
Summary of intangible assets [Line Items]    
Right of use 4,541 3,801
Other [member]    
Summary of intangible assets [Line Items]    
Right of use 6,525 4,414
Accumulated amortization [member]    
Summary of intangible assets [Line Items]    
Right of use R$ (99,106) R$ (42,535)