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EARNINGS (LOSS) PER SHARE - Basic earnings (losses) per share (Details) - BRL (R$) R$ / shares in Units, shares in Thousands, R$ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Basic earnings per share
Resulted of the period attributable to controlling shareholders'	R$ 10,035,111	R$ (2,057,101)	R$ 7,277,867	R$ (15,479,631)	R$ (15,479,631)
Weighted average number of shares in the period			1,361,264		1,361,264
Weighted average treasury shares			(12,042)		(12,042)
Weighted average number of outstanding shares			1,349,222		1,349,222
Basic loss per common share - RS	R$ 7.43770	R$ (1.52466)	R$ 5.39412	R$ (11.47301)	R$ (11.47301)

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- Definition

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

+ References

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- Definition

The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]

+ References

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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

+ References

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The weighted average total number of shares issued throughout the period.

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Number of shares of treasury stock determined by relating the portion of time within a reporting period that treasury shares have been outstanding to the total time in that period. Treasury stock is stock that the Entity has issued but subsequently reacquired.

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