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Financial risk management - Schedule of outstanding energy trading operations (Details) - Price risk - Electricity trading [member] - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Scenarios for sensitivity analysis
Unrealized loss from electricity trading	R$ (248,123)	R$ (189,018)
Probable
Scenarios for sensitivity analysis
Unrealized loss from electricity trading	(248,123)
25% [member]
Scenarios for sensitivity analysis
Unrealized loss from electricity trading	(244,212)
50% [member]
Scenarios for sensitivity analysis
Unrealized loss from electricity trading	(240,302)
(25)% [member]
Scenarios for sensitivity analysis
Unrealized loss from electricity trading	(252,034)
(50%) [member]
Scenarios for sensitivity analysis
Unrealized loss from electricity trading	R$ (255,942)

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- Definition

The gain (loss) on the change in fair value of the hedging instrument used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 24A
-Subparagraph c
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