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1 Operations (Details) - Sao paulo [member] R$ in Thousands | 12 Months Ended
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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.

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