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15 Intangible assets (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of intangible assets [Line Items]        
Cost R$ 48,687,584 R$ 44,626,255    
Accumulated amortization (14,282,009) (12,300,808)    
Net 34,405,575 32,325,447 R$ 29,012,460 R$ 33,466,132
Program contracts - commitments [member]        
Summary of intangible assets [Line Items]        
Cost 1,709,757 1,651,434    
Accumulated amortization (338,834) (286,559)    
Net 1,370,923 1,364,875    
Concession agreements - equity value [member]        
Summary of intangible assets [Line Items]        
Cost 671,904 2,066,459    
Accumulated amortization (188,129) (571,606)    
Net 483,775 1,494,853    
Concession agreements - economic value [member]        
Summary of intangible assets [Line Items]        
Cost 1,446,261 1,334,531    
Accumulated amortization (711,596) (621,679)    
Net 734,665 712,852 [1] 1,232,009 1,433,937
Program contracts [member]        
Summary of intangible assets [Line Items]        
Cost 23,160,119 19,413,768    
Accumulated amortization (6,799,812) (5,594,068)    
Net 16,360,307 13,819,700    
Services contracts - Sao Paulo [member]        
Summary of intangible assets [Line Items]        
Cost 20,579,676 19,217,091    
Accumulated amortization (5,707,072) (4,826,328)    
Net 14,872,604 14,390,763 [1] R$ 13,391,452 R$ 15,917,015
Software license of use [member]        
Summary of intangible assets [Line Items]        
Cost 978,085 829,739    
Accumulated amortization (437,460) (358,033)    
Net 540,625 471,706    
Right of use [member]        
Summary of intangible assets [Line Items]        
Cost 141,782 113,233    
Accumulated amortization (99,106) (42,535)    
Net R$ 42,676 R$ 70,698    
[1] As of December 31, 2019, intangible assets includes leases recognized before December 31, 2018 in accordance with IAS 17 amounting to R$ 292,824 - (R$ 315,717 as of December 31, 2018 -R$ R$ 98,077 recognized as concession agreements -equity value and R$ 217,640 recognized as program contracts).