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Operations (Details) - Sao Paulo [Member]
R$ in Thousands, Municipalities in Thousands
 12 Months Ended
Dec. 31, 2022
BRL (R$)
Municipalities
Dec. 31, 2021
BRL (R$)
Municipalities
IfrsStatementLineItems [Line Items]    
Total municipalities that have already signed contracts | Municipalities 351 342
Balance – intangible and contract assets R$ 45,292,307 R$ 42,260,091
   Percentage of intangible and contract assets 94.49% 93.80%
    Revenue from sanitation services (excluding construction revenue) R$ 17,767,561 R$ 15,490,808
    Percentage of revenue from sanitation services (excluding construction revenue) 95.37% 95.01%
Municipalities with expired contracts: | Municipalities 1 8
Balance – intangible and contract assets R$ 11,519 R$ 214,329
   Percentage of intangible and contract assets 0.02% 0.48%
   Revenue from sanitation services (excluding construction revenue) R$ 15,236 R$ 41,194
   Percentage of revenue from sanitation services (excluding construction revenue) 0.08% 0.25%
Municipalities with concession agreements due by 2030: | Municipalities 23 25
Balance – intangible and contract assets R$ 1,072,138 R$ 1,127,920
Percentage of intangible and contract assets 2.24% 2.50%
    Revenue from sanitation services (excluding construction revenue) R$ 711,452 R$ 653,408
    Percentage of revenue from sanitation services (excluding construction revenue) 3.82% 4.01%
 Municipality of São Paulo:    
   Percentage of intangible and contract assets 43.33% 43.11%
    Percentage of revenue from sanitation services (excluding construction revenue) 45.14% 44.45%