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1 Operations (Details) - Sao paulo [member]
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Municipalities
Dec. 31, 2019
BRL (R$)
Municipalities
OperationsLineItems [Line Items]    
Total municipalities that have already signed contracts | Municipalities [1] 342 325
Balance - intangible and contract assets R$ 39,440,568 R$ 35,990,087
Percentage of intangible and contract assets 93.08% 90.10%
Revenue from sanitation services (excluding construction revenue) R$ 14,406,803 R$ 13,700,777
Percentage of revenue from sanitation services (excluding construction revenue) 95.05% 84.92%
Municipalities with expired: | Municipalities 8 21
Balance - intangible and contract assets R$ 264,931 R$ 1,637,878
Percentage of intangible and contract assets 0.63% 4.10%
Revenue from sanitation services (excluding construction revenue) R$ 39,088 R$ 451,603
Percentage of revenue from sanitation services (excluding construction revenue) 0.26% 2.80%
Municipalities with concession agreements due by 2030: | Municipalities 25 27
Balance - intangible and contract assets R$ 1,436,529 R$ 1,181,172
Percentage of intangible and contract assets 3.39% 2.96%
Revenue from sanitation services (excluding construction revenue) R$ 597,483 R$ 588,628
Percentage of revenue from sanitation services (excluding construction revenue) 3.94% 3.65%
Municipality of Sao Paulo:    
Percentage of intangible and contract assets 37.94% 43.37%
Percentage of revenue from sanitation services (excluding construction revenue) 44.58% 44.48%
[1] Includes the municipality of Tapiratiba, which signed a contract in October 2019, to begin operating in April 2020.